Year	% of cohort
1960	65.305971
1961	65.192001
1962	64.721195
1963	65.216004
1964	66.019353
1965	65.371623
1966	65.116875
1967	64.280981
1968	63.948013
1969	62.584039
1970	62.009535
1971	62.428787
1972	62.210172
1973	62.313392
1974	61.835315
1975	61.40659
1976	61.398664
1977	60.412476
1978	59.972795
1979	59.094358
1980	58.493918
1981	58.714132
1982	58.891686
1983	58.766576
1984	57.815957
1985	58.435171
1986	61.858792
1987	60.968848
1988	60.692338
1989	60.171564
1990	58.808372
1991	56.711503
1992	55.146187
1993	53.406826
1994	51.903339
1995	49.604978
1996	50.19554
1997	51.419147
1998	53.357694
1999	52.209588
2000	51.138838
2001	51.651323
2002	51.273704
2003	51.32025
2004	51.223515
2005	50.338706
2006	52.006302
2007	51.839322
2008	52.665693
2009	56.246209
2010	57.469239
2011	59.193345
2012	59.767975
2013	60.156013
2014	60.928738
2015	63.392361
2016	65.573543
2017	66.559682
2018	65.98294
2019	66.567799
2020	62.966954
2021	60.084483
2022	52.302831