Year	% of cohort
1960	26.018078
1961	26.605922
1962	27.21107
1963	27.844142
1964	28.469895
1965	29.171087
1966	29.916323
1967	30.708709
1968	31.536448
1969	32.382909
1970	33.251992
1971	34.119168
1972	35.000469
1973	35.778227
1974	36.57578
1975	37.318868
1976	37.978532
1977	38.556533
1978	39.051796
1979	39.44403
1980	39.731852
1981	40.026918
1982	40.048372
1983	40.096805
1984	40.062928
1985	39.957635
1986	39.762086
1987	39.459124
1988	39.016759
1989	38.406168
1990	37.625187
1991	36.6562
1992	35.504153
1993	34.331291
1994	33.055311
1995	31.781701
1996	30.514685
1997	29.348935
1998	28.776925
1999	28.269888
2000	27.789066
2001	27.823348
2002	27.729579
2003	28.582433
2004	29.08015
2005	29.702013
2006	30.198093
2007	31.143736
2008	32.008104
2009	32.840936
2010	33.631077
2011	34.776226
2012	35.661076
2013	35.202649
2014	33.797916
2015	38.303219
2016	38.873337
2017	38.581527
2018	39.761484
2019	40.832801
2020	38.40694
2021	36.412734
2022	37.306559