Year	% of cohort
1971	56.4164199829102
1972	52.7095794677734
1973	57.4925117492676
1974	62.7235908508301
1975	63.2878608703613
1976	64.0131072998047
1977	63.7168502807617
1978	65.2816162109375
1979	67.871452331543
1980	67.8271331787109
1981	75.4741134643555
1982	72.1810302734375
1983	73.7590103149414
1984	73.4712066650391
1986	75.2147903442383
1987	72.0602264404297
1988	70.8646926879883
1989	69.9095230102539
1990	75.5052185058594
1991	69.7398376464844
1994	78.6580429077148
1998	66.7059707641602
1999	68.300407409668
2000	69.1350708007812
2001	65.3874969482422
2002	73.1596221923828
2003	75.8537368774414
2004	75.5116729736328
2005	72.4899597167969
2006	80.578483581543
2007	79.6104507446289
2008	82.2269821166992
2009	75.0886917114258
2011	80.3058700561523
2012	80.7140579223633
2013	79.0508575439453
2014	78.5538101196289
2015	80.452522277832
2016	77.0408782958984
2017	81.2800903320312
2018	69.290168762207
2019	67.9467163085938
2020	74.3024368286133
2021	59.8745613098145