Year	% of cohort
1960	49.880281
1961	49.886969
1962	50.570683
1963	50.914662
1964	51.484787
1965	52.342953
1966	52.120272
1967	52.616118
1968	53.440868
1969	53.738767
1970	53.939748
1971	54.379618
1972	55.049181
1973	56.001405
1974	56.176252
1975	56.646718
1976	57.097383
1977	57.789545
1978	58.398606
1979	58.805381
1980	59.661341
1981	59.881894
1982	60.445932
1983	60.006421
1984	60.343715
1985	60.706426
1986	60.697773
1987	60.623749
1988	60.777951
1989	60.01279
1990	59.977068
1991	59.444093
1992	58.043744
1993	57.487492
1994	60.602727
1995	60.695335
1996	60.770733
1997	61.257561
1998	61.798245
1999	62.118431
2000	62.521666
2001	62.019154
2002	62.508139
2003	62.988154
2004	63.466614
2005	64.026115
2006	64.213814
2007	64.996518
2008	63.736798
2009	64.890268
2010	65.130317
2011	65.499646
2012	64.818678
2013	65.170356
2014	66.122001
2015	66.480402
2016	66.947665
2017	67.2804
2018	66.51782
2019	66.556247
2020	64.955126
2021	62.200108
2022	62.090077