Year	% of cohort
1971	65.0110092163086
1972	64.9274063110352
1973	63.2834892272949
1974	64.8947601318359
1975	69.6830596923828
1976	65.1554336547852
1977	73.7928009033203
1978	72.8919830322266
1979	73.1041488647461
1980	75.0711898803711
1981	74.4389190673828
1982	71.4530715942383
1983	70.9585037231445
1984	76.7786102294922
1985	76.1183776855469
1986	80.0112075805664
1987	74.9573974609375
1988	76.735481262207
1989	80.6160202026367
1990	90.6151504516602
1991	86.0611724853516
1992	78.3954315185547
1996	89.0983276367188
1999	90.7970733642578
2001	89.8082275390625
2002	84.2077102661133
2003	91.0345993041992
2004	91.4297409057617
2005	92.0260772705078
2006	97.7313385009766
2007	84.3350372314453
2008	94.0696411132812
2009	93.8108825683594
2010	95.9990463256836
2011	96.0412216186523
2012	96.4168167114258
2013	91.3622894287109
2014	92.5896224975586
2015	86.7128677368164
2016	87.0302200317383