Year	% of cohort
1983	83.0669937133789
1984	85.2288208007812
1985	84.4175033569336
1986	83.1776885986328
1987	86.9359588623047
1988	88.7242889404297
1989	90.5771331787109
1990	90.7558670043945
1991	89.9411697387695
1992	90.5938491821289
1993	89.1199188232422
1994	90.3600082397461
2000	97.444091796875
2001	93.7291564941406
2002	87.5167388916016
2008	96.3031463623047
2009	93.1631317138672
2010	98.1307067871094
2011	96.1757736206055
2013	86.181282043457
2014	98.370231628418
2015	98.3658599853516
2016	97.3869094848633