Year	% of cohort
1986	79.4260711669922
1987	85.0393676757812
1988	87.5011215209961
1989	89.6929016113281
1990	89.6417083740234
1991	89.1141586303711
1992	89.6388092041016
1993	88.0776824951172
1994	88.8210220336914
2000	96.7449569702148
2001	93.7130966186523
2002	87.1606292724609
2008	95.9884796142578
2009	93.4850387573242
2010	97.9014663696289
2011	96.553092956543
2013	80.7306976318359
2014	98.5006103515625
2015	99.7613983154297
2016	96.4356079101562