Year	% of cohort
1960	36.951812
1961	37.666685
1962	36.843876
1963	38.589072
1964	39.329257
1965	39.961241
1966	40.508516
1967	41.317222
1968	40.896652
1969	42.703958
1970	43.401563
1971	44.525464
1972	45.117494
1973	46.413807
1974	47.444405
1975	48.666507
1976	49.790865
1977	50.647622
1978	49.115456
1979	52.783837
1980	50.703004
1981	42.866219
1982	44.410541
1983	45.847457
1984	52.622562
1985	53.462523
1986	54.328598
1987	54.728304
1988	55.612775
1989	62.510381
1990	59.92081
1991	63.423529
1992	63.625068
1993	64.472775
1994	64.682209
1995	65.427426
1996	66.0415
1997	66.87478
1998	68.015392
1999	68.990101
2000	70.037599
2001	70.627203
2002	72.017009
2003	70.902903
2004	73.616232
2005	74.948606
2006	75.140927
2007	76.051182
2008	75.86846
2009	76.3186
2010	75.835764
2011	76.827417
2012	77.94339
2013	78.095206
2014	79.159739
2015	79.398589
2016	80.244832
2017	80.530287
2018	81.063226
2019	80.304891
2020	76.221449
2021	76.438069
2022	77.835633