Year	% of cohort
1960	12.707631
1961	13.167574
1962	32.579338
1963	33.074009
1964	33.568302
1965	34.348916
1966	34.887291
1967	35.704102
1968	36.591783
1969	37.556508
1970	38.503707
1971	39.13219
1972	39.949606
1973	40.44355
1974	40.852222
1975	40.962812
1976	41.128686
1977	41.261603
1978	41.684481
1979	41.968166
1980	42.602826
1981	43.327126
1982	44.247406
1983	45.138023
1984	45.481709
1985	46.660907
1986	46.512727
1987	47.155982
1988	47.221884
1989	47.05929
1990	46.719749
1991	46.218483
1992	45.660689
1993	45.011799
1994	43.812713
1995	43.015789
1996	42.224806
1997	41.979248
1998	41.571111
1999	41.385886
2000	41.839139
2001	42.06359
2002	42.630977
2003	43.336733
2004	43.582016
2005	43.959157
2006	44.71737
2007	45.087948
2008	45.764474
2009	46.404792
2010	46.909538
2011	47.767534
2012	48.724773
2013	49.755059
2014	50.163878
2015	51.234424
2016	52.503146
2017	53.492646
2018	53.445797
2019	54.517663
2020	51.445729
2021	50.293579
2022	51.512169