Year	% of cohort
1970	45.9118118286133
1971	44.8731994628906
1972	45.1780395507812
1973	44.5843200683594
1974	44.360050201416
1975	47.2872200012207
1976	51.9900512695312
1977	51.1350288391113
1978	51.3392295837402
1979	50.5807609558105
1980	49.4389801025391
1981	52.8345603942871
1982	56.6631088256836
1983	57.7331581115723
1984	52.8214797973633
1985	55.7070503234863
1986	58.2694206237793
1987	58.1564788818359
1988	60.0348510742188
1989	60.9851989746094
1990	63.5055885314941
1991	66.4093322753906
1992	65.6247711181641
1993	68.3632736206055
1994	68.7849502563477
1995	70.9988632202148
1996	71.2200775146484
1997	72.2670974731445
1998	73.2659072875977
1999	75.1295318603516
2000	74.5535507202148
2001	77.7029418945312
2002	77.5475234985352
2003	77.7984237670898
2004	78.4881362915039
2005	78.6753692626953
2006	79.4272232055664
2007	80.0441665649414
2008	81.790771484375
2009	82.0160903930664
2010	82.0540313720703
2011	81.4446487426758
2012	80.994140625
2013	82.6201629638672
2014	83.6377487182617
2015	83.0271835327148
2016	85.2417678833008
2017	84.8533020019531
2018	85.2410583496094
2019	85.1687393188477
2020	86.1315689086914
2021	86.2168579101562