Fertility in USA

This page gives information of type fertility about the country USA.
See all pages giving information on fertility for particular countries|See all pages giving information about USA

Data sources

Most of the data on this page comes from the Human Fertility Database (website www.humanfertility.org) (data downloaded December 2013, last updated January 2013). The data collected by the Human Fertility Database is based on government data collection by the United States government. Details about the modalities of data collection are available here.

Qualitative history of fertility-relevant events

Year	Event	Postulated effect seen in fertility statistics
1973	Roe v Wade led to nationwide legalization of abortion (specifically, first trimester abortion)	No immediate effects or changes to trends. Possible reasons: (a) abortion availability isn't a major determinant of fertility, (b) many states had already legalized abortion, (c) illegal abortions were already widely available, (d) the effect of the law on the availability of legal abortions took some time to materialize.

Key quantitative metrics

Metric	Most recent measurement, along with year and source	Extreme values, along with year and source
crude birth rate (CBR)	12.94 (year 2010, based on Human Fertility Database data last updated January 2013)	Data available 1933-2010; maximum value 25.82 in 1947, minimum value 12.94 in 2010
total fertility rate (TFR)	1.928 (year 2010, based on Human Fertility Database data last updated January 2013)	Data available 1933-2010; maximum value 3.738 in 1957, minimum value 1.739 in 1976
TFR40	1.874 (year 2010, based on Human Fertility Database data last updated January 2013)	Data available 1933-2010; maximum value 3.654 in 1957, minimum value 1.716 in 1976
TFR birth order distribution	birth orders 1, 2, 3, 4, 5 (and more) (respectively): 0.400, 0.316, 0.167, 0.081, 0.103 (year 2010, based on Human Fertility Database data last updated January 2013)	Data available 1933-2010
Completed cohort fertility	2.018 (1960 birth cohort, based on Human Fertility Database data last updated January 2013)	Data available for birth cohorts 1918-1960; maximum value 3.256 for 1933 birth cohort, minimum value 1.972 for 1953 birth cohort

Data on period fertility

Data on total indicators only without breakdown by birth order

Year	CBR (births per 1000 people per year)	CBR minus previous year's CBR	TFR (sum of all age-specific fertility rates), ballpark for replacement fertility is 2.1	TFR minus previous year's TFR	TFR40 (sum of age-specific fertility rates up to the age of 40), almost equal to TFR because births above the age of 40 are rare	TFR40 minus previous year's TFR40
1933	16.57		2.012		1.911
1934	17.15	0.58	2.072	0.06	1.973	0.062
1935	16.93	-0.22	2.038	-0.034	1.944	-0.029
1936	16.75	-0.18	2.007	-0.031	1.919	-0.025
1937	17.09	0.34	2.038	0.031	1.955	0.036
1938	17.61	0.52	2.092	0.054	2.01	0.055
1939	17.3	-0.31	2.05	-0.042	1.974	-0.036
1940	17.88	0.58	2.113	0.063	2.037	0.063
1941 (beginning of US involvement in World War II)	18.89	1.01	2.226	0.113	2.152	0.115
1942	20.99	2.1	2.465	0.239	2.392	0.24
1943	21.92	0.93	2.566	0.101	2.489	0.097
1944	20.99	-0.93	2.439	-0.127	2.359	-0.13
1945 (end of World War II)	20.33	-0.66	2.38	-0.059	2.297	-0.062
1946	23.67	3.34	2.83	0.45	2.747	0.45
1947	25.82	2.15	3.161	0.331	3.077	0.33
1948	24.2	-1.62	3.009	-0.152	2.93	-0.147
1949	23.94	-0.26	3.022	0.013	2.945	0.015
1950	23.52	-0.42	3.02	-0.002	2.944	-0.001
1951	24.45	0.93	3.203	0.183	3.124	0.18
1952	24.7	0.25	3.302	0.099	3.222	0.098
1953	24.65	-0.05	3.372	0.07	3.292	0.07
1954	24.92	0.27	3.494	0.122	3.411	0.119
1955	24.64	-0.28	3.538	0.044	3.456	0.045
1956	24.88	0.24	3.654	0.116	3.57	0.114
1957	24.97	0.09	3.738	0.084	3.654	0.084
1958	24.25	-0.72	3.689	-0.049	3.609	-0.045
1959	23.96	-0.29	3.689	0	3.609	0
1960	23.65	-0.31	3.667	-0.022	3.587	-0.022
1961	23.33	-0.32	3.626	-0.041	3.545	-0.042
1962	22.43	-0.9	3.481	-0.145	3.403	-0.142
1963	21.74	-0.69	3.354	-0.127	3.28	-0.123
1964	21.07	-0.67	3.222	-0.132	3.149	-0.131
1965	19.43	-1.64	2.926	-0.296	2.858	-0.291
1966	18.44	-0.99	2.714	-0.212	2.651	-0.207
1967	17.83	-0.61	2.564	-0.15	2.507	-0.144
1968	17.56	-0.27	2.467	-0.097	2.416	-0.091
1969	17.86	0.3	2.457	-0.01	2.41	-0.006
1970	18.29	0.43	2.461	0.004	2.417	0.007
1971	17.2	-1.09	2.268	-0.193	2.23	-0.187
1972	15.58	-1.62	2.008	-0.26	1.975	-0.255
1973 (abortion legalized throughout the USA)	14.85	-0.73	1.871	-0.137	1.842	-0.133
1974	14.82	-0.03	1.827	-0.044	1.802	-0.04
1975	14.6	-0.22	1.769	-0.058	1.744	-0.058
1976	14.57	-0.03	1.739	-0.03	1.716	-0.028
1977	15.14	0.57	1.783	0.044	1.761	0.045
1978	15.01	-0.13	1.747	-0.036	1.727	-0.034
1979	15.57	0.56	1.795	0.048	1.774	0.047
1980	15.91	0.34	1.821	0.026	1.801	0.027
1981	15.82	-0.09	1.805	-0.016	1.785	-0.016
1982	15.89	0.07	1.814	0.009	1.794	0.009
1983	15.57	-0.32	1.783	-0.031	1.764	-0.03
1984	15.56	-0.01	1.792	0.009	1.773	0.009
1985	15.81	0.25	1.835	0.043	1.815	0.042
1986	15.65	-0.16	1.835	0	1.814	-0.001
1987	15.73	0.08	1.865	0.03	1.843	0.029
1988	15.99	0.26	1.922	0.057	1.898	0.055
1989	16.37	0.38	1.999	0.077	1.974	0.076
1990	16.66	0.29	2.069	0.07	2.042	0.068
1991	16.26	-0.4	2.058	-0.011	2.029	-0.013
1992	15.85	-0.41	2.043	-0.015	2.013	-0.016
1993	15.4	-0.45	2.019	-0.024	1.988	-0.025
1994	15.03	-0.37	2.003	-0.016	1.971	-0.017
1995	14.66	-0.37	1.982	-0.021	1.948	-0.023
1996	14.46	-0.2	1.98	-0.002	1.945	-0.003
1997	14.25	-0.21	1.974	-0.006	1.938	-0.007
1998	14.3	0.05	2.003	0.029	1.965	0.027
1999	14.21	-0.09	2.009	0.006	1.97	0.005
2000	14.41	0.2	2.054	0.045	2.012	0.042
2001	14.15	-0.26	2.031	-0.023	1.989	-0.023
2002	14	-0.15	2.024	-0.007	1.981	-0.008
2003	14.11	0.11	2.053	0.029	2.007	0.026
2004	14.06	-0.05	2.058	0.005	2.01	0.003
2005	14.01	-0.05	2.061	0.003	2.012	0.002
2006	14.3	0.29	2.112	0.051	2.061	0.049
2007	14.33	0.03	2.122	0.01	2.07	0.009
2008	13.97	-0.36	2.074	-0.048	2.02	-0.05
2009	13.47	-0.5	2.002	-0.072	1.948	-0.072
2010	12.94	-0.53	1.928	-0.074	1.874	-0.074
Mean	18.0137179487	-0.0471428571	2.3858333333	-0.0010909091	2.3314102564	-0.0004805195
Median	16.615	-0.13	2.0595	-0.002	2.012	-0.001
Standard deviation	3.8378718091	0.7508203534	0.6196736765	0.1109433452	0.6026563156	0.1096561144
Slope for best linear fit (using linear regression)	-0.1170643281	-0.0066822651	-0.0128025519	-0.0008526999	-0.0119700806	-0.000900021
Multiplier for best log-linear fit (using linear regression on the logarithm)	0.993534563		0.9949225462		0.9951862764

Data on total fertility rate broken down by birth order

Year	TFR	TFR1	TFR2	TFR3	TFR4	TFR5+	TFR1 proportion	TFR2 proportion	TFR3 proportion	TFR4 proportion	TFR5+ proportion
1933	2.012	0.595	0.439	0.291	0.2	0.487	0.2957256461	0.2181908549	0.1446322068	0.0994035785	0.2420477137
1934	2.072	0.642	0.45	0.294	0.201	0.485	0.3098455598	0.2171814672	0.1418918919	0.097007722	0.2340733591
1935	2.038	0.671	0.441	0.28	0.19	0.455	0.3292443572	0.2163886163	0.1373895976	0.0932286555	0.2232580962
1936	2.007	0.678	0.45	0.272	0.18	0.427	0.3378176383	0.2242152466	0.1355256602	0.0896860987	0.2127553563
1937	2.038	0.713	0.466	0.272	0.176	0.412	0.3498527969	0.2286555447	0.1334641806	0.0863591757	0.2021589794
1938	2.092	0.748	0.49	0.28	0.175	0.4	0.3575525813	0.2342256214	0.1338432122	0.0836520076	0.1912045889
1939	2.05	0.732	0.494	0.278	0.17	0.376	0.3570731707	0.2409756098	0.1356097561	0.0829268293	0.1834146341
1940	2.113	0.751	0.524	0.292	0.174	0.372	0.3554188358	0.2479886417	0.1381921439	0.0823473734	0.1760530052
1941	2.226	0.835	0.551	0.302	0.176	0.362	0.3751123091	0.2475292004	0.1356693621	0.0790655885	0.16262354
1942	2.465	0.985	0.617	0.324	0.183	0.357	0.3995943205	0.2503042596	0.1314401623	0.0742393509	0.1448275862
1943	2.566	0.923	0.691	0.371	0.205	0.376	0.3597038192	0.2692907249	0.1445830086	0.0798908807	0.1465315666
1944	2.439	0.815	0.651	0.382	0.212	0.379	0.3341533415	0.2669126691	0.1566215662	0.0869208692	0.1553915539
1945	2.38	0.788	0.633	0.374	0.209	0.376	0.331092437	0.2659663866	0.1571428571	0.0878151261	0.1579831933
1946	2.83	1.061	0.772	0.406	0.219	0.371	0.3749116608	0.2727915194	0.1434628975	0.077385159	0.1310954064
1947	3.161	1.3	0.84	0.435	0.222	0.365	0.4112622588	0.2657386903	0.1376146789	0.0702309396	0.115469788
1948	3.009	1.116	0.862	0.449	0.224	0.357	0.370887338	0.2864739116	0.1492190096	0.0744433367	0.1186440678
1949	3.022	1.036	0.9	0.48	0.24	0.367	0.342819325	0.2978160159	0.1588352085	0.0794176042	0.1214427531
1950	3.02	0.97	0.908	0.518	0.257	0.368	0.321192053	0.3006622517	0.1715231788	0.0850993377	0.1218543046
1951	3.203	1.032	0.932	0.565	0.287	0.386	0.3221979394	0.2909772089	0.1763971277	0.0896034967	0.12051202
1952	3.302	1.022	0.946	0.608	0.318	0.408	0.3095093882	0.2864930345	0.1841308298	0.0963052695	0.1235614779
1953	3.372	1.017	0.955	0.629	0.34	0.431	0.3016014235	0.2832147094	0.1865361803	0.1008303677	0.1278173191
1954	3.494	1.034	0.966	0.661	0.367	0.465	0.2959358901	0.2764739554	0.1891814539	0.1050372066	0.1330852891
1955	3.538	1.02	0.963	0.679	0.385	0.491	0.2882984737	0.2721876767	0.1919163369	0.1088185415	0.1387789712
1956	3.654	1.044	0.976	0.704	0.407	0.524	0.2857142857	0.267104543	0.192665572	0.1113847838	0.1434044882
1957	3.738	1.049	0.981	0.724	0.428	0.556	0.2806313537	0.2624398074	0.1936864633	0.1144997325	0.1487426431
1958	3.689	1.002	0.96	0.718	0.437	0.573	0.2716183247	0.2602331255	0.1946326918	0.1184602873	0.1553266468
1959	3.689	0.972	0.943	0.721	0.45	0.603	0.2634860396	0.2556248306	0.1954459203	0.1219842776	0.163458932
1960	3.667	0.945	0.919	0.72	0.458	0.625	0.2577038451	0.2506135806	0.1963457867	0.1248977366	0.170439051
1961	3.626	0.923	0.884	0.708	0.461	0.65	0.2545504688	0.2437948152	0.195256481	0.1271373414	0.1792608935
1962	3.481	0.881	0.838	0.673	0.444	0.644	0.253088193	0.2407354209	0.1933352485	0.1275495547	0.1850043091
1963	3.354	0.863	0.804	0.636	0.424	0.627	0.2573047108	0.2397137746	0.1896243292	0.1264162194	0.186940966
1964	3.222	0.859	0.764	0.598	0.399	0.601	0.2666045934	0.2371198014	0.1855990068	0.1238361266	0.1865301055
1965	2.926	0.819	0.7	0.527	0.349	0.533	0.2799043062	0.2392344498	0.1801093643	0.1192754614	0.1821599453
1966	2.714	0.83	0.66	0.465	0.299	0.46	0.3058216654	0.243183493	0.1713338246	0.1101694915	0.1694915254
1967	2.564	0.807	0.65	0.433	0.27	0.404	0.3147425897	0.2535101404	0.1688767551	0.1053042122	0.1575663027
1968	2.467	0.83	0.637	0.406	0.244	0.352	0.3364410215	0.2582083502	0.1645723551	0.0989055533	0.1426834212
1969	2.457	0.835	0.652	0.408	0.237	0.325	0.3398453398	0.2653642654	0.1660561661	0.0964590965	0.1322751323
1970	2.461	0.86	0.664	0.408	0.228	0.3	0.3494514425	0.2698090207	0.1657862657	0.0926452662	0.121901666
1971	2.268	0.804	0.63	0.37	0.202	0.261	0.3544973545	0.2777777778	0.1631393298	0.0890652557	0.1150793651
1972	2.008	0.744	0.582	0.311	0.165	0.206	0.3705179283	0.2898406375	0.1548804781	0.0821713147	0.1025896414
1973	1.871	0.714	0.565	0.283	0.14	0.169	0.3816141101	0.3019775521	0.1512560128	0.0748262961	0.0903260289
1974	1.827	0.715	0.572	0.272	0.127	0.143	0.3913519431	0.3130815545	0.148877942	0.0695128626	0.0782703886
1975	1.769	0.7	0.557	0.266	0.118	0.127	0.3957037875	0.3148671566	0.1503674392	0.0667043527	0.0717919729
1976	1.739	0.691	0.554	0.267	0.113	0.115	0.3973548016	0.318573893	0.1535365152	0.0649798735	0.0661299597
1977	1.783	0.711	0.572	0.279	0.114	0.108	0.3987661245	0.3208076276	0.1564778463	0.0639371845	0.0605720695
1978	1.747	0.707	0.559	0.274	0.11	0.098	0.4046937607	0.3199771036	0.1568402977	0.062965083	0.0560961649
1979	1.795	0.734	0.574	0.281	0.111	0.094	0.408913649	0.3197771588	0.156545961	0.0618384401	0.052367688
1980	1.821	0.761	0.578	0.281	0.11	0.091	0.4179022515	0.3174080176	0.1543108182	0.0604063701	0.0499725426
1981	1.805	0.758	0.575	0.278	0.108	0.085	0.4199445983	0.3185595568	0.1540166205	0.059833795	0.0470914127
1982	1.814	0.759	0.586	0.28	0.107	0.082	0.4184123484	0.3230429989	0.1543550165	0.058985667	0.0452039691
1983	1.783	0.748	0.578	0.274	0.105	0.078	0.4195176669	0.3241727426	0.1536735838	0.0588895121	0.0437464947
1984	1.792	0.751	0.587	0.276	0.104	0.075	0.4190848214	0.3275669643	0.1540178571	0.0580357143	0.0418526786
1985	1.835	0.769	0.602	0.285	0.106	0.073	0.4190735695	0.3280653951	0.1553133515	0.0577656676	0.0397820163
1986	1.835	0.773	0.598	0.286	0.106	0.072	0.421253406	0.3258855586	0.1558583106	0.0577656676	0.0392370572
1987	1.865	0.783	0.606	0.294	0.109	0.072	0.4198391421	0.3249329759	0.1576407507	0.0584450402	0.0386058981
1988	1.922	0.804	0.622	0.306	0.115	0.075	0.418314256	0.3236212279	0.1592091571	0.0598335068	0.0390218522
1989	1.999	0.839	0.64	0.32	0.121	0.079	0.4197098549	0.32016008	0.16008004	0.0605302651	0.0395197599
1990	2.069	0.869	0.659	0.331	0.127	0.083	0.4200096665	0.3185113581	0.159980667	0.0613823103	0.0401159981
1991	2.058	0.865	0.653	0.328	0.127	0.085	0.4203109815	0.3172983479	0.1593780369	0.0617103984	0.0413022352
1992	2.043	0.853	0.654	0.325	0.126	0.085	0.4175232501	0.3201174743	0.1590797846	0.0616740088	0.0416054821
1993	2.019	0.852	0.646	0.316	0.123	0.083	0.4219910847	0.3199603764	0.1565131253	0.0609212481	0.0411094601
1994	2.003	0.855	0.638	0.311	0.119	0.08	0.4268597104	0.3185222167	0.1552670994	0.0594108837	0.0399400899
1995	1.982	0.852	0.631	0.306	0.116	0.077	0.4298688194	0.3183652876	0.1543895055	0.0585267407	0.0388496468
1996	1.98	0.837	0.637	0.311	0.118	0.078	0.4227272727	0.3217171717	0.1570707071	0.0595959596	0.0393939394
1997	1.974	0.823	0.64	0.314	0.119	0.078	0.4169199595	0.3242147923	0.1590678825	0.0602836879	0.0395136778
1998	2.003	0.821	0.655	0.325	0.123	0.079	0.4098851722	0.3270094858	0.1622566151	0.0614078882	0.0394408387
1999	2.009	0.82	0.656	0.329	0.124	0.079	0.4081632653	0.3265306122	0.1637630662	0.0617222499	0.0393230463
2000	2.054	0.832	0.668	0.341	0.13	0.082	0.4050632911	0.3252190847	0.1660175268	0.0632911392	0.0399221032
2001	2.031	0.813	0.664	0.341	0.132	0.083	0.400295421	0.3269325455	0.1678975874	0.0649926145	0.0408665682
2002	2.024	0.808	0.66	0.34	0.132	0.084	0.3992094862	0.3260869565	0.1679841897	0.0652173913	0.0415019763
2003	2.053	0.824	0.666	0.344	0.134	0.085	0.4013638578	0.3244033122	0.1675596688	0.0652703361	0.0414028251
2004	2.058	0.82	0.664	0.349	0.137	0.087	0.3984450923	0.3226433431	0.1695821186	0.0665694849	0.0422740525
2005	2.061	0.817	0.665	0.351	0.14	0.089	0.3964095099	0.3226589034	0.1703056769	0.0679281902	0.0431829209
2006	2.112	0.84	0.676	0.359	0.145	0.092	0.3977272727	0.3200757576	0.1699810606	0.068655303	0.0435606061
2007	2.122	0.846	0.676	0.36	0.146	0.094	0.3986804901	0.3185673893	0.1696512724	0.068803016	0.0442978322
2008	2.074	0.829	0.656	0.349	0.145	0.094	0.399710704	0.3162970106	0.1682738669	0.0699132112	0.0453230473
2009	2.002	0.801	0.632	0.335	0.14	0.094	0.4000999001	0.3156843157	0.1673326673	0.0699300699	0.046953047
2010	1.928	0.771	0.609	0.321	0.135	0.092	0.3998962656	0.3158713693	0.1664937759	0.0700207469	0.0477178423
Mean	2.3858333333	0.8425128205	0.6771153846	0.3943589744	0.2035128205	0.2684102564	0.3645555973	0.2885144401	0.1622614355	0.0807994667	0.1039054461
Median	2.0595	0.8235	0.6505	0.333	0.1675	0.2335	0.3864830266	0.2992391338	0.1591444709	0.0743413438	0.1088345033
Standard deviation	0.6196736765	0.1214572496	0.1441573798	0.1421416866	0.1072485575	0.1917955104	0.053871927	0.0356017852	0.0168704113	0.0212757634	0.0617835356
Slope for best linear fit	-0.0128025519	-0.0010534529	-0.0008180554	-0.001935811	-0.0023491698	-0.0066476056	0.0014971516	0.0013115698	0.0001388892	-0.000544514	-0.0024036944
Multiplier for best linear fit (using log-linear regression)	0.9949225462	0.999100776	0.9995852219	0.9959687334	0.9881189687	0.969534074	1.0041995528	1.004686471	1.0010515263	0.9931617014	0.9744819611

Data on completed fertility

CCF and CCF40, not broken down by birth order

Cohort	CCF	CCF minus previous year's CCF	CCF40	CCF40 minus previous year's CCF40
1918	2.507		2.429
1919	2.595	0.088	2.517	0.088
1920	2.708	0.113	2.628	0.111
1921	2.749	0.041	2.673	0.045
1922	2.784	0.035	2.714	0.041
1923	2.852	0.068	2.786	0.072
1924	2.942	0.09	2.879	0.093
1925	2.986	0.044	2.929	0.05
1926	3.025	0.039	2.974	0.045
1927	3.092	0.067	3.046	0.072
1928	3.109	0.017	3.067	0.021
1929	3.171	0.062	3.132	0.065
1930	3.239	0.068	3.204	0.072
1931	3.241	0.002	3.21	0.006
1932	3.253	0.012	3.226	0.016
1933	3.256	0.003	3.231	0.005
1934	3.254	-0.002	3.23	-0.001
1935	3.214	-0.04	3.192	-0.038
1936	3.131	-0.083	3.11	-0.082
1937	3.059	-0.072	3.039	-0.071
1938	2.983	-0.076	2.964	-0.075
1939	2.892	-0.091	2.872	-0.092
1940	2.795	-0.097	2.775	-0.097
1941	2.68	-0.115	2.66	-0.115
1942	2.561	-0.119	2.542	-0.118
1943	2.463	-0.098	2.444	-0.098
1944	2.365	-0.098	2.345	-0.099
1945	2.292	-0.073	2.27	-0.075
1946	2.215	-0.077	2.191	-0.079
1947	2.149	-0.066	2.125	-0.066
1948	2.103	-0.046	2.077	-0.048
1949	2.058	-0.045	2.03	-0.047
1950	2.025	-0.033	1.995	-0.035
1951	1.996	-0.029	1.965	-0.03
1952	1.978	-0.018	1.945	-0.02
1953	1.971	-0.007	1.937	-0.008
1954	1.973	0.002	1.938	0.001
1955	1.981	0.008	1.944	0.006
1956	1.984	0.003	1.946	0.002
1957	1.986	0.002	1.947	0.001
1958	1.994	0.008	1.954	0.007
1959	2.01	0.016	1.967	0.013
1960	2.018	0.008	1.974	0.007
1961			1.981	0.007
1962			1.989	0.008
1963			2	0.011
1964			2.011	0.011
1965			2.024	0.013
1966			2.045	0.021
1967			2.062	0.017
1968			2.061	-0.001
1969			2.055	-0.006
1970			2.068	0.013

Completed cohort fertilities by birth order

Year of birth	CCF	CCF1	CCF2	CCF3	CCF4	CCF5+	CCF1 proportion	CCF2 proportion	CCF3 proportion	CCF4 proportion	CCF5+ proportion
1918	2.507	0.819	0.66	0.416	0.242	0.372	0.3266852812	0.263262864	0.1659353809	0.0965297168	0.1483845233
1919	2.595	0.835	0.678	0.436	0.254	0.392	0.3217726397	0.2612716763	0.1680154143	0.0978805395	0.1510597303
1920	2.708	0.856	0.706	0.461	0.271	0.413	0.3161004431	0.2607090103	0.1702363368	0.1000738552	0.1525110783
1921	2.749	0.865	0.719	0.472	0.278	0.415	0.3146598763	0.2615496544	0.1716987996	0.1011276828	0.1509639869
1922	2.784	0.867	0.73	0.481	0.284	0.422	0.3114224138	0.2622126437	0.1727729885	0.1020114943	0.1515804598
1923	2.852	0.877	0.746	0.496	0.295	0.439	0.3075035063	0.2615708275	0.1739130435	0.1034361851	0.1539270687
1924	2.942	0.89	0.764	0.516	0.31	0.462	0.3025152957	0.2596872876	0.1753908906	0.1053704963	0.1570360299
1925	2.986	0.891	0.77	0.528	0.32	0.478	0.2983924983	0.2578700603	0.1768251842	0.1071667783	0.1600803751
1926	3.025	0.899	0.772	0.537	0.33	0.488	0.2971900826	0.2552066116	0.1775206612	0.1090909091	0.161322314
1927	3.092	0.912	0.781	0.554	0.343	0.503	0.2949547219	0.2525873221	0.1791720569	0.110931436	0.1626778784
1928	3.109	0.904	0.783	0.563	0.351	0.508	0.2907687359	0.2518494693	0.1810871663	0.112898038	0.1633965905
1929	3.171	0.904	0.799	0.579	0.365	0.524	0.2850835699	0.2519709871	0.1825922422	0.1151056449	0.165247556
1930	3.239	0.912	0.817	0.598	0.376	0.536	0.2815683853	0.2522383452	0.1846248842	0.1160852115	0.1654831738
1931	3.241	0.915	0.821	0.602	0.379	0.524	0.2823202715	0.2533168775	0.1857451404	0.1169392163	0.1616784943
1932	3.253	0.922	0.828	0.607	0.381	0.515	0.2834306794	0.2545342761	0.1865969874	0.117122656	0.1583154012
1933	3.256	0.928	0.834	0.611	0.382	0.501	0.285012285	0.2561425061	0.1876535627	0.1173218673	0.1538697789
1934	3.254	0.937	0.84	0.616	0.38	0.481	0.2879532883	0.258143823	0.1893054702	0.1167793485	0.1478180701
1935	3.214	0.939	0.84	0.61	0.371	0.454	0.292159303	0.261356565	0.1897946484	0.1154324829	0.1412570006
1936	3.131	0.933	0.83	0.595	0.356	0.416	0.2979878633	0.2650910252	0.1900351325	0.1137016927	0.1328648994
1937	3.059	0.934	0.827	0.582	0.339	0.377	0.3053285387	0.2703497875	0.1902582543	0.1108205296	0.1232428898
1938	2.983	0.934	0.824	0.567	0.32	0.338	0.3131076098	0.2762319812	0.1900771036	0.1072745558	0.1133087496
1939	2.892	0.93	0.815	0.546	0.3	0.302	0.3215767635	0.2818118949	0.1887966805	0.1037344398	0.1044260028
1940	2.795	0.925	0.804	0.522	0.276	0.267	0.3309481216	0.2876565295	0.1867620751	0.0987477639	0.0955277281
1941	2.68	0.921	0.791	0.492	0.249	0.227	0.3436567164	0.2951492537	0.1835820896	0.0929104478	0.0847014925
1942	2.561	0.915	0.777	0.458	0.222	0.189	0.3572823116	0.3033971105	0.178836392	0.0866848887	0.0737992971
1943	2.463	0.907	0.762	0.431	0.2	0.164	0.3682501015	0.3093788063	0.1749898498	0.0812017864	0.0665854649
1944	2.365	0.894	0.742	0.403	0.182	0.145	0.378012685	0.3137420719	0.1704016913	0.0769556025	0.0613107822
1945	2.292	0.889	0.729	0.38	0.166	0.129	0.3878708551	0.3180628272	0.1657940663	0.072425829	0.0562827225
1946	2.215	0.887	0.716	0.356	0.147	0.108	0.4004514673	0.3232505643	0.1607223476	0.0663656885	0.048758465
1947	2.149	0.882	0.703	0.337	0.134	0.094	0.4104234528	0.3271288972	0.1568171242	0.0623545835	0.043741275
1948	2.103	0.872	0.691	0.325	0.127	0.089	0.4146457442	0.3285782216	0.1545411317	0.0603899192	0.0423204945
1949	2.058	0.858	0.677	0.316	0.122	0.085	0.416909621	0.3289601555	0.1535471331	0.0592808552	0.0413022352
1950	2.025	0.85	0.667	0.31	0.117	0.081	0.4197530864	0.329382716	0.1530864198	0.0577777778	0.04
1951	1.996	0.844	0.659	0.304	0.113	0.077	0.4228456914	0.3301603206	0.1523046092	0.0566132265	0.0385771543
1952	1.978	0.839	0.654	0.3	0.111	0.074	0.4241658241	0.3306370071	0.1516683519	0.0561172902	0.0374115268
1953	1.971	0.835	0.651	0.3	0.111	0.074	0.4236428209	0.3302891933	0.1522070015	0.0563165906	0.0375443937
1954	1.973	0.835	0.651	0.302	0.111	0.074	0.4232133806	0.3299543842	0.1530663964	0.0562595033	0.0375063355
1955	1.981	0.837	0.653	0.304	0.112	0.075	0.4225138819	0.3296314992	0.1534578496	0.0565371025	0.0378596668
1956	1.984	0.838	0.654	0.306	0.113	0.074	0.4223790323	0.3296370968	0.154233871	0.0569556452	0.0372983871
1957	1.986	0.837	0.654	0.308	0.113	0.074	0.4214501511	0.329305136	0.1550855992	0.056898288	0.0372608258
1958	1.994	0.839	0.656	0.31	0.114	0.075	0.4207622869	0.3289869609	0.1554663992	0.0571715145	0.0376128385
1959	2.01	0.844	0.66	0.314	0.116	0.076	0.4199004975	0.328358209	0.1562189055	0.0577114428	0.0378109453
1960	2.018	0.846	0.662	0.316	0.118	0.076	0.4192269574	0.3280475719	0.1565906838	0.0584737364	0.0376610505
Mean	2.596255814	0.8836511628	0.7394651163	0.4503953488	0.2395581395	0.2834186047	0.3503674125	0.2904339542	0.1711029771	0.0879298665	0.1002633752
Median	2.68	0.889	0.742	0.461	0.254	0.302	0.3266852812	0.2818118949	0.1727729885	0.0978805395	0.1044260028
Standard deviation	0.4828065813	0.0368903676	0.0677732033	0.1164051094	0.103287694	0.1809349044	0.0560769306	0.0327712606	0.0138817744	0.0241446562	0.0533177096
Slope for best linear fit	-0.0298221081	-0.0010581395	-0.0028115373	-0.0067111145	-0.0065099668	-0.0127346723	0.0038833374	0.0023908927	-0.0006960455	-0.0016170082	-0.0039614536
Multiplier for best logarithmic fit (using log-linear regression)	0.9879755138	0.998793826	0.9961059474	0.9838449885	0.968284066	0.9429253732	1.01094998	1.0082293877	0.9958192027	0.9800688909	0.9544015616

CCF40 by birth order

Cohort	CCF40	CCF40_1	CCF40_2	CCF40_3	CCF40_4	CCF40_5+	CCF40_1 proportion	CCF40_2 proportion	CCF40_3 proportion	CCF40_4 proportion	CCF40_5+ proportion
1918	2.429	0.815	0.653	0.405	0.23	0.327	0.3355290243	0.2688349115	0.166735282	0.0946891725	0.1346233018
1919	2.517	0.831	0.672	0.426	0.243	0.345	0.3301549464	0.2669845054	0.1692491061	0.0965435042	0.137067938
1920	2.628	0.852	0.7	0.451	0.259	0.366	0.3242009132	0.2663622527	0.1716133942	0.0985540335	0.1392694064
1921	2.673	0.861	0.713	0.462	0.267	0.37	0.3221099888	0.266741489	0.1728395062	0.0998877666	0.1384212495
1922	2.714	0.864	0.725	0.472	0.274	0.379	0.3183492999	0.2671333825	0.1739130435	0.1009579956	0.1396462786
1923	2.786	0.874	0.741	0.488	0.286	0.398	0.3137114142	0.2659727207	0.1751615219	0.1026561378	0.1428571429
1924	2.879	0.887	0.759	0.508	0.301	0.423	0.3080930879	0.263633206	0.1764501563	0.104550191	0.146926016
1925	2.929	0.888	0.765	0.521	0.312	0.442	0.3031751451	0.2611812905	0.1778764083	0.1065209969	0.1509047456
1926	2.974	0.896	0.768	0.531	0.323	0.456	0.3012777404	0.2582380632	0.1785474109	0.1086079354	0.15332885
1927	3.046	0.909	0.777	0.548	0.337	0.475	0.2984241628	0.2550886408	0.1799080762	0.1106369009	0.1559422193
1928	3.067	0.902	0.78	0.558	0.345	0.483	0.2940984676	0.2543201826	0.181936746	0.1124877731	0.1574828823
1929	3.132	0.902	0.796	0.575	0.359	0.501	0.2879948914	0.2541507024	0.1835887612	0.1146232439	0.1599616858
1930	3.204	0.91	0.814	0.594	0.372	0.514	0.284019975	0.2540574282	0.1853932584	0.1161048689	0.1604244694
1931	3.21	0.913	0.818	0.598	0.375	0.506	0.284423676	0.2548286604	0.1862928349	0.1168224299	0.1576323988
1932	3.226	0.92	0.825	0.604	0.378	0.499	0.285182889	0.2557346559	0.1872287663	0.1171729696	0.1546807192
1933	3.231	0.927	0.832	0.609	0.379	0.486	0.286908078	0.2575054163	0.1884865367	0.1173011452	0.1504178273
1934	3.23	0.935	0.838	0.613	0.377	0.467	0.2894736842	0.2594427245	0.1897832817	0.1167182663	0.1445820433
1935	3.192	0.937	0.838	0.607	0.368	0.442	0.2935463659	0.2625313283	0.1901629073	0.1152882206	0.1384711779
1936	3.11	0.931	0.828	0.592	0.353	0.405	0.2993569132	0.2662379421	0.1903536977	0.1135048232	0.1302250804
1937	3.039	0.932	0.825	0.58	0.336	0.366	0.3066798289	0.2714708786	0.190852254	0.1105626851	0.1204343534
1938	2.964	0.933	0.822	0.564	0.317	0.328	0.3147773279	0.2773279352	0.1902834008	0.1069500675	0.1106612686
1939	2.872	0.928	0.812	0.543	0.297	0.292	0.3231197772	0.282729805	0.1890668524	0.1034122563	0.1016713092
1940	2.775	0.923	0.802	0.519	0.273	0.258	0.3326126126	0.289009009	0.187027027	0.0983783784	0.092972973
1941	2.66	0.919	0.789	0.488	0.246	0.219	0.3454887218	0.2966165414	0.1834586466	0.092481203	0.0823308271
1942	2.542	0.913	0.774	0.455	0.219	0.182	0.359166011	0.3044846577	0.178992919	0.0861526357	0.0715971676
1943	2.444	0.904	0.759	0.427	0.197	0.156	0.3698854337	0.3105564648	0.1747135843	0.0806055646	0.0638297872
1944	2.345	0.891	0.738	0.399	0.179	0.138	0.3799573561	0.3147121535	0.1701492537	0.0763326226	0.0588486141
1945	2.27	0.885	0.725	0.376	0.162	0.122	0.3898678414	0.3193832599	0.1656387665	0.0713656388	0.0537444934
1946	2.191	0.884	0.711	0.351	0.143	0.102	0.4034687357	0.3245093565	0.1602008215	0.0652670014	0.0465540849
1947	2.125	0.877	0.697	0.332	0.13	0.088	0.4127058824	0.328	0.1562352941	0.0611764706	0.0414117647
1948	2.077	0.867	0.684	0.32	0.123	0.082	0.4174289841	0.3293211363	0.1540683678	0.0592200289	0.0394800193
1949	2.03	0.853	0.67	0.311	0.118	0.078	0.4201970443	0.3300492611	0.1532019704	0.0581280788	0.0384236453
1950	1.995	0.844	0.66	0.304	0.113	0.075	0.4230576441	0.3308270677	0.1523809524	0.056641604	0.037593985
1951	1.965	0.837	0.651	0.297	0.109	0.07	0.4259541985	0.3312977099	0.1511450382	0.0554707379	0.0356234097
1952	1.945	0.832	0.645	0.293	0.107	0.068	0.4277634961	0.3316195373	0.1506426735	0.0550128535	0.0349614396
1953	1.937	0.828	0.642	0.293	0.106	0.067	0.4274651523	0.3314403717	0.1512648425	0.0547237997	0.0345895715
1954	1.938	0.828	0.641	0.295	0.107	0.068	0.427244582	0.330753354	0.1522187822	0.0552115583	0.0350877193
1955	1.944	0.83	0.643	0.297	0.108	0.068	0.4269547325	0.3307613169	0.1527777778	0.0555555556	0.0349794239
1956	1.946	0.83	0.643	0.298	0.108	0.067	0.4265159301	0.3304213772	0.1531346351	0.0554984584	0.0344295992
1957	1.947	0.829	0.643	0.3	0.109	0.067	0.4257832563	0.3302516692	0.1540832049	0.0559835645	0.0344119158
1958	1.954	0.83	0.645	0.302	0.109	0.067	0.4247697032	0.3300921187	0.1545547595	0.0557830092	0.0342886387
1959	1.967	0.835	0.648	0.305	0.111	0.068	0.4245043213	0.3294356889	0.1550584647	0.0564311134	0.0345704118
1960	1.974	0.837	0.65	0.307	0.112	0.069	0.4240121581	0.3292806484	0.1555217832	0.0567375887	0.0349544073
1961	1.981	0.838	0.652	0.309	0.113	0.069	0.4230186774	0.3291267037	0.1559818274	0.057041898	0.0348308935
1962	1.989	0.841	0.653	0.311	0.114	0.07	0.4228255405	0.3283056812	0.1563599799	0.0573152338	0.0351935646
1963	2	0.845	0.655	0.313	0.115	0.071	0.4225	0.3275	0.1565	0.0575	0.0355
1964	2.011	0.847	0.658	0.316	0.117	0.072	0.4211834908	0.3272003978	0.1571357534	0.0581800099	0.035803083
1965	2.024	0.849	0.66	0.321	0.12	0.074	0.4194664032	0.3260869565	0.1585968379	0.0592885375	0.0365612648
1966	2.045	0.854	0.665	0.326	0.123	0.077	0.417603912	0.3251833741	0.1594132029	0.0601466993	0.0376528117
1967	2.062	0.859	0.67	0.33	0.125	0.078	0.416585839	0.3249272551	0.1600387973	0.0606207565	0.0378273521
1968	2.061	0.859	0.67	0.33	0.125	0.078	0.416787967	0.3250849102	0.1601164483	0.0606501698	0.037845706
1969	2.055	0.857	0.667	0.329	0.125	0.077	0.4170316302	0.3245742092	0.1600973236	0.0608272506	0.0374695864
1970	2.068	0.863	0.67	0.331	0.126	0.078	0.417311412	0.3239845261	0.1600580271	0.0609284333	0.0377176015
Average	2.4588490566	0.874245283	0.7203962264	0.4213962264	0.2128301887	0.2300566038	0.366296722	0.2987793365	0.1688017163	0.0818718837	0.0842777005
Median	2.345	0.864	0.7	0.399	0.179	0.138	0.3799573561	0.3147121535	0.166735282	0.0763326226	0.0588486141
Standard deviation	0.4814705597	0.0369114875	0.0696403783	0.1164788425	0.103003498	0.1720749406	0.0567415659	0.031666009	0.0139692295	0.0246448513	0.0514436576
Slope for best linear fit (using linear regression)	-0.024585712	-0.0011116755	-0.0028163199	-0.0056907757	-0.0053713111	-0.0095990163	0.0031715338	0.001808151	-0.0006232393	-0.0013504614	-0.0030070163
Multiplier for best logarithmic fit (using linear regression on logarithm)	0.9899874801	0.9987363561	0.9960977259	0.9863286055	0.9734182761	0.9525685005	1.0088373602	1.0061720435	0.9963041203	0.9832632187	0.9622025729
$R^{2}$ for linear regression	0.6218913116	0.2163323091	0.3900588379	0.5692948102	0.6485523633	0.7421754488	0.745116934	0.7776266504	0.4747370755	0.7161439639	0.8148848941