Year	% of cohort
1987	70.7970886230469
1988	72.3160781860352
1991	82.5476989746094
1992	74.6449584960938
1996	86.2616271972656
1999	87.5226974487305
2002	81.4826431274414
2003	88.5869064331055
2004	88.0812835693359
2005	89.7164611816406
2006	95.6278381347656
2007	82.275032043457
2008	92.1402130126953
2009	92.637336730957
2010	94.1269226074219
2011	93.329963684082
2012	94.5770034790039
2013	89.949951171875
2014	92.8469696044922
2015	85.946662902832
2016	86.6455535888672