Year	% of cohort
1971	41.7533988952637
1972	41.2938995361328
1973	46.4335289001465
1974	48.4960784912109
1976	58.1851501464844
1979	75.7155914306641
1980	80.7925109863281
1981	69.1119079589844
1982	55.3539695739746
1983	61.5442695617676
1984	63.0634613037109
1985	63.1969604492188
1986	67.9092102050781
1987	66.3345794677734
1988	65.086669921875
1989	57.8486785888672
1990	57.7902183532715
1991	61.0422706604004
2000	40.704948425293
2001	40.4769592285156
2002	44.9389495849609
2003	43.034481048584
2008	46.4119300842285
2009	44.8609085083008
2011	49.4781608581543
2012	47.2264785766602
2013	47.5765609741211
2014	58.4985389709473
2015	72.2169570922852
2016	67.9583892822266
2017	64.4103164672852
2018	73.1099319458008