Year	% of cohort
1960	27.690509
1961	28.434253
1962	29.103164
1963	29.510629
1964	30.247275
1965	30.868651
1966	31.629362
1967	32.176043
1968	32.96022
1969	33.595737
1970	34.390349
1971	35.16203
1972	36.019624
1973	36.999713
1974	38.035551
1975	38.939745
1976	39.86751
1977	40.963084
1978	41.592543
1979	42.544792
1980	43.231433
1981	43.545019
1982	43.557726
1983	43.784571
1984	43.619726
1985	43.685894
1986	43.447873
1987	43.158369
1988	42.681381
1989	42.329344
1990	41.516599
1991	40.788381
1992	40.278412
1993	39.718119
1994	39.142036
1995	38.715254
1996	38.332431
1997	38.539918
1998	37.79539
1999	37.689244
2000	37.159009
2001	36.921648
2002	36.862558
2003	36.57054
2004	37.371304
2005	38.084207
2006	38.980017
2007	40.014362
2008	40.992521
2009	42.049915
2010	43.136185
2011	43.909357
2012	45.120067
2013	45.935083
2014	47.122315
2015	47.801575
2016	48.618793
2017	48.801603
2018	49.666698
2019	50.033805
2020	48.813243
2021	47.493504
2022	48.288605