Year	% of cohort
1960	31.147215
1961	31.614205
1962	32.365965
1963	31.49321
1964	31.184667
1965	30.840585
1966	31.130581
1967	30.643764
1968	30.305273
1969	30.843823
1970	31.490405
1971	32.093999
1972	32.967997
1973	33.38932
1974	33.955232
1975	35.846511
1976	37.948874
1977	39.8452
1978	41.656166
1979	43.014177
1980	44.261379
1981	45.012147
1982	45.412424
1983	45.516527
1984	44.5783
1985	43.215379
1986	41.852431
1987	40.341278
1988	39.10848
1989	38.592344
1990	37.913277
1991	37.220541
1992	36.401586
1993	35.754069
1994	35.317015
1995	34.942077
1996	33.431013
1997	31.801864
1998	30.324933
1999	30.83822
2000	31.322352
2001	32.853392
2002	34.334875
2003	35.848967
2004	38.380437
2005	41.660569
2006	43.87145
2007	44.881964
2008	45.185362
2009	46.771367
2010	48.636682
2011	51.106258
2012	53.540829
2013	55.815318
2014	59.033038
2015	59.312302
2016	61.284621
2017	63.232941
2018	63.609755
2019	65.720274
2020	65.04574
2021	62.926422
2022	62.664211