Year	% of cohort
1960	52.968598
1961	54.474789
1962	55.968589
1963	57.304478
1964	58.36553
1965	58.609585
1966	58.958502
1967	59.317069
1968	59.578116
1969	59.809621
1970	60.162633
1971	59.867308
1972	60.222882
1973	60.58349
1974	60.670512
1975	61.113459
1976	61.525527
1977	61.954832
1978	62.35888
1979	62.873547
1980	63.097711
1981	63.43372
1982	63.851487
1983	64.054957
1984	64.51133
1985	64.775396
1986	65.135612
1987	65.474492
1988	65.885533
1989	66.314302
1990	66.698762
1991	67.044488
1992	67.49569
1993	67.967582
1994	68.325886
1995	68.445664
1996	69.223588
1997	68.976049
1998	69.050072
1999	68.727491
2000	68.924524
2001	68.748326
2002	68.980335
2003	69.136462
2004	70.752848
2005	71.768374
2006	72.738638
2007	73.729426
2008	74.693907
2009	75.779987
2010	76.56141
2011	76.480741
2012	75.93812
2013	75.53585
2014	75.454432
2015	76.949047
2016	77.797436
2017	78.948777
2018	79.221108
2019	78.828563
2020	79.240303
2021	76.400107
2022	76.314639