Year	% of cohort
1960	57.431495
1961	59.957844
1962	61.390671
1963	62.363022
1964	63.722771
1965	64.710828
1966	65.772431
1967	66.842272
1968	67.99206
1969	68.079388
1970	68.818084
1971	68.975391
1972	68.952973
1973	68.828176
1974	70.22558
1975	70.940351
1976	71.833318
1977	73.567018
1978	73.010931
1979	72.632448
1980	71.993696
1981	73.814252
1982	74.726502
1983	76.496845
1984	78.356976
1985	78.271759
1986	78.467565
1987	77.207769
1988	76.808933
1989	77.021438
1990	77.002849
1991	77.771014
1992	78.971145
1993	79.225705
1994	78.69036
1995	78.62194
1996	77.713138
1997	76.356291
1998	76.053434
1999	76.789226
2000	77.826055
2001	79.556141
2002	80.943859
2003	81.965783
2004	82.527994
2005	82.992798
2006	83.469114
2007	83.612748
2008	83.682049
2009	83.848742
2010	83.52623
2011	83.573503
2012	83.393001
2013	83.578201
2014	84.075846
2015	84.596974
2016	84.871099
2017	85.130951
2018	85.450837
2019	85.52541
2020	85.515323
2021	82.044698
2022	82.396729