Year	% of cohort
1970	42.3598594665527
1971	41.9086990356445
1972	41.8257713317871
1973	42.0401611328125
1974	42.7280502319336
1975	43.5130996704102
1976	44.3950996398926
1977	45.3664703369141
1978	46.3981399536133
1979	47.3458290100098
1980	48.0331115722656
1981	48.9090118408203
1982	49.694149017334
1983	50.8479804992676
1984	52.0222396850586
1985	53.0844993591309
1986	54.1469116210938
1987	62.3984107971191
1988	62.7064781188965
1989	62.3532295227051
1990	62.1230583190918
1991	61.8264312744141
1992	61.5960083007812
1993	61.3581886291504
1994	61.0964012145996
1995	61.5783500671387
1996	62.0745315551758
1997	62.5639915466309
1998	62.8014602661133
1999	63.4413986206055
2000	60.6057815551758
2001	61.1775588989258
2002	62.4818801879883
2003	64.0184173583984
2004	65.2568283081055
2005	66.5839309692383
2006	68.0439605712891
2007	69.4269485473633
2008	70.6136016845703
2009	71.8136901855469
2010	71.7567901611328
2011	73.9037017822266
2012	75.6214904785156
2013	79.6610107421875
2014	87.2809600830078
2015	84.8650436401367
2016	83.5398025512695
2017	82.0881118774414
2018	79.1464004516602
2019	87.0758209228516
2020	87.6616516113281
2021	89.3467102050781