Year	% of cohort
1971	67.8954010009766
1972	67.7769622802734
1973	56.0650291442871
1974	58.9113616943359
1975	59.6644592285156
1976	63.6219596862793
1977	82.3497085571289
1981	75.5488510131836
1982	73.7827301025391
1983	78.5888366699219
1984	79.8039779663086
1985	81.0642623901367
1986	84.5610275268555
1987	83.2585601806641
1988	84.4845275878906
1989	82.9737014770508
1990	84.0035171508789
1991	83.5879287719727
1992	85.6103668212891
1993	92.5483169555664
1994	87.1346435546875
1995	91.1853866577148
1996	88.1878814697266
2001	89.2478866577148
2002	89.0713424682617
2003	88.6298522949219
2004	87.0873184204102
2007	86.0865478515625
2008	90.2133483886719
2009	91.7996673583984
2010	89.5358428955078
2011	89.5260696411133
2012	86.4065628051758
2013	84.0093383789062
2016	98.8817367553711
2017	99.5062637329102