Year	% of cohort
1960	51.210146
1961	46.627801
1962	52.675386
1963	53.679411
1964	54.787503
1965	56.012301
1966	56.238115
1967	56.810563
1968	58.302568
1969	59.168647
1970	60.169215
1971	62.17768
1972	62.470078
1973	61.745129
1974	62.84316
1975	64.757699
1976	64.578628
1977	64.630781
1978	65.500484
1979	66.523048
1980	67.469885
1981	68.170546
1982	68.286477
1983	68.130182
1984	68.239837
1985	70.622912
1986	70.080119
1987	70.809783
1988	71.847172
1989	71.248715
1990	71.715701
1991	70.893839
1992	70.579873
1993	70.196944
1994	69.848009
1995	69.007522
1996	68.267309
1997	67.152496
1998	65.699032
1999	65.541396
2000	64.863786
2001	64.133554
2002	64.264033
2003	64.478802
2004	65.027617
2005	65.38714
2006	66.224062
2007	66.867966
2008	67.523202
2009	68.306618
2010	68.838809
2011	69.41562
2012	70.514898
2013	71.532098
2014	70.201417
2015	69.508162
2016	69.890033
2017	70.150709
2018	70.370146
2019	70.837826
2020	66.856005
2021	62.177868
2022	63.56649