Year	% of cohort
1971	67.4040908813477
1972	65.2886123657227
1973	68.8426971435547
1974	74.9418029785156
1975	89.0177993774414
1976	80.1907196044922
1977	83.0220184326172
1978	84.6021270751953
1979	81.8627777099609
1980	80.2362594604492
1981	80.2567672729492
1982	76.9419097900391
1983	79.4060974121094
1984	67.9145126342773
1985	67.7019424438477
1986	68.9597702026367
1987	66.5777435302734
1988	63.1642913818359
1989	75.6447525024414
1990	73.5273590087891
1991	75.1135787963867
1992	79.8490524291992
1993	79.3547668457031
1994	79.7797775268555
1995	78.1864395141602
1996	75.0241394042969
1997	75.1151504516602
1998	77.3228073120117
1999	81.8915863037109
2000	79.9945526123047
2001	83.857307434082
2002	81.2947769165039
2003	75.68115234375
2004	79.2712097167969
2005	80.3210372924805
2006	83.9274673461914
2007	82.7995376586914
2008	84.1982192993164
2009	93.9124984741211
2010	93.0289077758789
2011	91.6228866577148
2012	94.1129989624023
2013	92.6940002441406
2014	92.8109512329102
2015	95.7922286987305
2016	97.5025405883789
2017	95.7065963745117
2018	96.3937301635742
2019	96.8324203491211
2020	94.3251419067383
2021	98.6020965576172