Year	% of cohort
1987	62.8818817138672
1988	64.8346176147461
1991	76.9600982666016
1992	68.2373123168945
1996	81.9048385620117
1999	84.2390365600586
2002	77.0888290405273
2003	85.9030990600586
2004	85.0960922241211
2005	87.1917037963867
2006	94.4944229125977
2007	78.2223129272461
2008	89.1149063110352
2009	90.1216888427734
2010	91.7962417602539
2011	90.0885696411133
2012	92.4070510864258
2013	89.4609680175781
2014	90.2239303588867
2015	81.4254913330078
2016	82.2785415649414