Year	% of cohort
1960	50.183009
1961	50.964531
1962	50.98052
1963	52.404454
1964	53.104878
1965	53.801539
1966	54.52613
1967	55.337511
1968	56.145226
1969	56.921524
1970	40.472978
1971	58.318755
1972	59.275664
1973	59.817172
1974	60.493211
1975	61.229232
1976	61.83766
1977	62.42878
1978	63.033141
1979	63.608871
1980	64.147892
1981	64.665296
1982	65.149073
1983	65.72131
1984	66.631945
1985	67.677944
1986	68.841754
1987	70.034617
1988	71.129061
1989	72.100982
1990	72.693622
1991	72.485214
1992	73.117715
1993	73.299575
1994	73.61126
1995	74.073254
1996	74.816387
1997	75.608981
1998	76.467378
1999	77.615842
2000	78.611574
2001	79.34641
2002	80.026067
2003	80.592448
2004	81.050512
2005	81.399049
2006	81.666149
2007	81.782915
2008	82.137539
2009	82.389083
2010	82.768699
2011	83.282706
2012	83.809021
2013	84.367073
2014	84.907383
2015	85.40194
2016	85.815549
2017	86.106744
2018	86.340776
2019	86.389888
2020	83.084015
2021	78.503885
2022	80.468493