Year	% of cohort
1960	65.175589
1961	66.070976
1962	64.873429
1963	65.544238
1964	66.869164
1965	66.547838
1966	66.84227
1967	66.736839
1968	66.629037
1969	66.188147
1970	65.76677
1971	66.907791
1972	66.087686
1973	66.586899
1974	65.822067
1975	64.50311
1976	64.455606
1977	63.749387
1978	63.352941
1979	62.056132
1980	62.537394
1981	61.962494
1982	61.693953
1983	60.900882
1984	59.531962
1985	60.125149
1986	62.498656
1987	61.909897
1988	60.805307
1989	59.977662
1990	58.806324
1991	57.504905
1992	56.758983
1993	54.188272
1994	54.040666
1995	52.510691
1996	52.609076
1997	51.796723
1998	51.454919
1999	50.664049
2000	52.640006
2001	51.87479
2002	50.379827
2003	51.33025
2004	52.464886
2005	52.094335
2006	53.605088
2007	55.721894
2008	55.805003
2009	56.365574
2010	56.343169
2011	56.877092
2012	60.575081
2013	61.978708
2014	63.587789
2015	65.109118
2016	66.118266
2017	66.884915
2018	67.273839
2019	65.941151
2020	62.119369
2021	62.091409
2022	64.022337