Year	% of cohort
1971	51.9332313537598
1972	55.0062484741211
1973	57.9611511230469
1974	54.8643417358398
1975	60.1139106750488
1976	58.6822204589844
1977	60.9396781921387
1978	72.3289413452148
1979	63.5001106262207
1987	66.0596618652344
1993	39.6633682250977
1994	75.4937362670898
1995	76.9133834838867
1996	84.3976364135742
1998	76.8230361938477
1999	76.7998809814453
2000	76.4049530029297
2001	77.4338531494141
2002	73.8523864746094
2003	75.2533416748047
2004	75.3694610595703
2005	76.6059265136719
2006	80.3722686767578
2008	97.2667465209961
2009	91.6930999755859
2010	93.8363494873047
2011	86.0647888183594
2012	94.4127578735352
2014	84.0549774169922
2015	92.0217208862305
2016	93.7620391845703
2017	99.0566711425781
2018	97.0855484008789
2019	97.9515991210938
2020	99.6949615478516
2021	99.4705810546875