Year	% of cohort
1972	59.2741317749023
1973	61.4856300354004
1974	67.2201538085938
1975	63.1695404052734
1976	57.3616485595703
1977	65.6960067749023
1978	66.1661529541016
1979	66.8860778808594
1980	72.2730331420898
1981	69.9894638061523
1982	74.4668884277344
1983	62.9346389770508
1984	73.7719421386719
1985	72.7166366577148
1986	76.8849563598633
1987	73.9865188598633
1990	66.7303237915039
1999	77.7906188964844
2006	81.7702865600586
2007	62.9556007385254
2008	77.9723281860352
2009	76.2907485961914
2010	68.3940887451172
2011	78.6855926513672
2014	79.1887130737305
2015	71.2656707763672
2016	54.9689102172852
2017	51.4138412475586
2018	77.3749237060547
2021	80.2272872924805