Year	% of cohort
1971	39.5986213684082
1972	41.6921806335449
1973	44.1875190734863
1974	47.9861717224121
1976	58.2690696716309
1977	56.333438873291
1979	76.088623046875
1980	81.777229309082
1981	71.3767013549805
1982	57.0043907165527
1983	62.5529518127441
1984	63.9577713012695
1985	64.661491394043
1986	68.8982467651367
1987	67.1790924072266
1988	66.6342391967773
1989	59.5797805786133
1990	58.9006385803223
1991	59.967098236084
1999	45.2568511962891
2000	41.7322883605957
2001	41.2480316162109
2002	46.6470184326172
2003	45.9160614013672
2008	48.5136489868164
2009	47.1933288574219
2011	51.9381484985352
2012	51.1689682006836
2013	52.2274208068848
2014	61.9732208251953
2015	74.7947387695312
2016	70.7109603881836
2017	68.0818710327148
2018	76.648681640625