Year	% of cohort
1960	25.407849
1961	24.96656
1962	25.272803
1963	25.412011
1964	25.62978
1965	25.81106
1966	25.927561
1967	26.125521
1968	26.653143
1969	27.056346
1970	27.665407
1971	28.34049
1972	29.147371
1973	30.014291
1974	31.077779
1975	31.74827
1976	32.41338
1977	33.182533
1978	34.103651
1979	35.024353
1980	35.752395
1981	36.261527
1982	36.326368
1983	36.411188
1984	35.951516
1985	35.05495
1986	34.071954
1987	33.029582
1988	31.720519
1989	31.024889
1990	30.25864
1991	29.226173
1992	28.460858
1993	27.404235
1994	26.887317
1995	26.203095
1996	25.562381
1997	24.577849
1998	23.393784
1999	24.443234
2000	25.583026
2001	27.084967
2002	28.490218
2003	30.350123
2004	32.562837
2005	34.640879
2006	36.409223
2007	37.584818
2008	38.934036
2009	40.046007
2010	41.23684
2011	42.170405
2012	43.708668
2013	44.765651
2014	45.276407
2015	45.989905
2016	46.897727
2017	47.711839
2018	47.953676
2019	49.500583
2020	48.408063
2021	46.861151
2022	47.02527