Year	% of cohort
1970	75.8092727661133
1971	74.2158737182617
1972	78.1037673950195
1973	72.4980087280273
1975	77.8853607177734
1976	75.1274108886719
1977	75.1006011962891
1978	77.264030456543
1979	72.5790786743164
1980	77.4361572265625
1981	74.4626770019531
1984	79.1188507080078
1985	84.6025466918945
1986	80.1836700439453
1987	82.3899993896484
1988	82.3924179077148
1990	80.8061370849609
1991	83.4169006347656
1992	83.9950637817383
1993	86.7203521728516
1994	87.0187606811523
1995	86.2680282592773
1999	90.1274490356445
2000	92.8315505981445
2001	90.2186126708984
2004	83.7612686157227
2005	93.0213394165039
2006	86.1558380126953
2007	94.4609603881836
2008	94.6344299316406
2009	90.2413482666016
2010	91.6920471191406
2011	89.7829132080078
2012	88.7021789550781
2013	90.9346694946289
2014	94.5100631713867
2015	93.3468933105469
2020	97.1194305419922