Year	% of cohort
1987	79.4141693115234
1988	81.4462966918945
1991	89.7848205566406
1992	82.4145889282227
1996	92.0956192016602
1999	94.3122634887695
2002	87.1061325073242
2003	93.6234512329102
2004	95.0410919189453
2005	94.4995193481445
2006	100
2007	86.5829391479492
2008	96.1510925292969
2009	95.0650787353516
2010	98.0115814208984
2011	99.0030975341797
2012	98.3970718383789
2013	92.7480621337891
2014	92.4397964477539
2015	87.5267715454102
2016	87.4355316162109