Year	% of cohort
1960	44.325705
1961	44.877907
1962	45.525668
1963	46.362929
1964	47.056453
1965	47.925154
1966	48.89333
1967	49.865015
1968	50.849757
1969	51.906275
1970	52.663234
1971	53.495815
1972	54.357876
1973	55.150417
1974	55.988245
1975	56.82258
1976	57.951843
1977	58.75368
1978	59.529172
1979	60.219568
1980	60.933927
1981	61.705288
1982	62.509142
1983	63.298084
1984	64.137087
1985	64.957718
1986	65.737657
1987	66.313771
1988	67.041661
1989	67.613909
1990	68.118297
1991	68.652323
1992	69.483529
1993	70.428259
1994	66.715362
1995	52.805127
1996	52.919529
1997	52.917708
1998	52.861548
1999	52.810643
2000	52.793424
2001	52.768433
2002	52.854628
2003	65.504975
2004	65.443731
2005	65.280498
2006	65.029406
2007	64.855463
2008	65.085536
2009	66.868584
2010	68.646029
2011	69.902218
2012	71.342429
2013	72.738305
2014	74.016575
2015	72.424976
2016	72.448136
2017	72.783695
2018	72.880655
2019	73.250809
2020	73.367067
2021	73.263939
2022	74.122219