Year	% of cohort
1971	34.1481513977051
1972	33.2583198547363
1973	38.7300605773926
1974	39.2938194274902
1976	49.6130981445312
1979	72.3785400390625
1980	77.6480484008789
1981	61.6741485595703
1982	46.8117790222168
1983	54.2552680969238
1984	56.5487213134766
1985	55.8849601745605
1986	61.9549713134766
1987	59.9069595336914
1988	58.8107109069824
1989	50.1646690368652
1990	49.8135299682617
1991	54.922191619873
2000	31.1564197540283
2001	30.2790699005127
2002	36.079891204834
2003	29.9228096008301
2008	37.0158996582031
2009	34.9745712280273
2011	33.6309700012207
2012	30.9677104949951
2013	30.3505592346191
2014	40.9547386169434
2015	54.821891784668
2016	50.951099395752
2017	50.8316802978516
2018	62.0849914550781