Year	% of cohort
1993	79.9103164672852
1994	76.4619293212891
1995	79.2927398681641
1996	67.1449279785156
1999	91.4499969482422
2000	60.1501007080078
2002	82.079963684082
2003	73.4141693115234
2004	74.1343612670898
2005	69.5937576293945
2006	60.9776802062988
2007	68.6332168579102
2008	71.9647216796875
2009	66.8827285766602
2010	87.8957672119141
2011	83.9051818847656
2012	77.1157531738281
2014	74.4133834838867
2017	79.7799301147461