Year	% of cohort
1960	64.476823
1961	64.353553
1962	62.877038
1963	64.038369
1964	65.757958
1965	64.207051
1966	64.284676
1967	63.721397
1968	62.622675
1969	61.416633
1970	61.854132
1971	61.95937
1972	61.147275
1973	60.61431
1974	60.374291
1975	58.371334
1976	57.959653
1977	58.360031
1978	57.801613
1979	56.685118
1980	56.697709
1981	56.278106
1982	57.654823
1983	56.727475
1984	56.151615
1985	56.631374
1986	59.636219
1987	59.110413
1988	58.729323
1989	57.811721
1990	55.142378
1991	54.686725
1992	53.138656
1993	48.341891
1994	45.021481
1995	47.545269
1996	52.647819
1997	54.221629
1998	53.930342
1999	55.257955
2000	55.990232
2001	55.410319
2002	55.78255
2003	57.011723
2004	57.261686
2005	56.252168
2006	56.540892
2007	57.464312
2008	59.483689
2009	61.8407
2010	62.246647
2011	63.970117
2012	64.600167
2013	65.709114
2014	65.897144
2015	67.163459
2016	67.411432
2017	67.781673
2018	68.450393
2019	69.975224
2020	70.574001
2021	66.911154
2022	70.696271