Year	% of cohort
1960	36.755662
1961	37.320921
1962	37.869878
1963	38.478124
1964	38.969578
1965	39.438093
1966	39.868338
1967	40.321961
1968	40.803205
1969	41.277957
1970	41.804408
1971	42.499987
1972	43.187079
1973	43.916321
1974	44.654099
1975	45.334222
1976	46.101726
1977	46.868789
1978	47.40389
1979	48.006077
1980	48.608836
1981	49.188939
1982	49.713769
1983	50.167311
1984	50.22675
1985	50.546561
1986	49.775716
1987	48.650811
1988	46.440954
1989	44.8473
1990	42.4607
1991	40.046644
1992	37.975485
1993	37.702629
1994	33.813739
1995	32.250556
1996	31.953836
1997	31.203673
1998	29.791833
1999	28.602052
2000	27.665475
2001	27.031339
2002	26.510559
2003	27.021713
2004	28.196114
2005	29.423315
2006	33.173993
2007	36.697617
2008	39.805352
2009	41.401635
2010	45.237056
2011	45.558985
2012	46.369958
2013	47.863269
2014	49.174469
2015	52.953793
2016	56.895671
2017	59.849797
2018	57.896638
2019	56.585592
2020	56.744331
2021	45.054326
2022	57.261511