Year	% of cohort
1970	36.8237609863281
1971	37.5328483581543
1972	51.1427001953125
1973	42.1136283874512
1975	45.0451812744141
1976	41.7157897949219
1980	16.4503002166748
1981	64.9344787597656
1982	48.3179817199707
1983	51.2041206359863
1987	52.7641105651855
1988	44.9196586608887
1991	60.4590606689453
1992	59.068920135498
1995	77.1946029663086
2000	69.9549865722656
2001	70.820182800293
2002	76.0381011962891
2005	74.2651901245117
2006	75.6433868408203
2007	81.5872573852539
2008	81.7323303222656
2009	89.7731094360352
2010	89.0964736938477
2011	88.6156005859375
2012	89.5040664672852
2013	88.1218109130859
2014	84.1380920410156
2015	83.8548736572266
2016	80.498291015625
2017	87.9692230224609
2019	87.1033096313477
2020	89.1069412231445