Year	% of cohort
1960	41.289363
1961	42.762631
1962	44.360442
1963	45.070626
1964	45.965837
1965	46.799985
1966	46.950303
1967	47.878026
1968	48.248392
1969	48.840634
1970	49.033148
1971	46.055502
1972	46.124981
1973	44.538035
1974	45.604506
1975	43.818005
1976	43.251673
1977	42.89059
1978	43.980987
1979	43.533613
1980	42.09704
1981	41.935828
1982	42.392884
1983	42.410702
1984	42.174462
1985	43.445911
1986	42.714974
1987	42.283982
1988	41.993343
1989	40.872861
1990	39.737086
1991	38.658109
1992	37.938745
1993	36.681622
1994	36.984993
1995	37.260299
1996	37.666394
1997	37.865848
1998	38.2987
1999	39.076623
2000	39.437235
2001	39.758249
2002	40.135737
2003	40.032064
2004	41.281692
2005	43.887438
2006	47.049871
2007	48.325939
2008	49.192527
2009	50.679536
2010	51.544037
2011	53.355954
2012	55.407721
2013	57.652564
2014	58.237617
2015	59.787571
2016	61.635387
2017	62.042962
2018	63.811933
2019	64.337804
2020	64.012673
2021	63.99612
2022	65.623891