Year	% of cohort
1971	63.4833793640137
1972	63.2492904663086
1973	62.3534317016602
1974	62.1486282348633
1975	63.627799987793
1976	64.8590927124023
1977	66.5448608398438
1978	66.2487564086914
1979	66.4835968017578
1980	66.0600204467773
1981	66.5371170043945
1982	67.2576599121094
1983	67.6124725341797
1984	67.3663101196289
1985	68.1810073852539
1986	69.2860717773438
1987	71.17138671875
1988	71.2994918823242
1989	71.4000701904297
1990	72.8061599731445
1991	73.27001953125
1992	73.6052627563477
1993	74.4763031005859
1994	75.1021423339844
1995	76.1918106079102
1996	76.7559585571289
1997	76.9717788696289
1998	76.9845199584961
1999	76.9716415405273
2000	76.8587875366211
2001	79.0610427856445
2002	78.2802124023438
2003	77.9449920654297
2004	78.012809753418
2005	78.5853881835938
2006	78.1758804321289
2007	78.4032974243164
2008	80.5090866088867
2009	81.2543869018555
2010	81.3151473999023
2011	82.1400375366211
2012	82.0476989746094
2013	83.4186477661133
2014	86.9810333251953
2015	87.0238037109375
2016	86.1117706298828
2017	86.0698699951172
2018	86.72705078125
2019	89.5867767333984
2020	89.4529800415039
2021	89.9777526855469