Year	% of cohort
1979	90.2872161865234
1980	92.0978164672852
1983	92.2123184204102
1984	90.7864227294922
1985	92.0071334838867
1991	80.3832931518555
1994	89.3034973144531
1995	78.5277481079102
1996	89.2758483886719
1997	90.374267578125
1998	89.3788375854492
1999	82.0078582763672
2000	90.8539733886719
2001	89.0513610839844
2003	91.6004104614258
2008	88.3399810791016
2011	98.1205368041992
2012	96.311637878418
2015	92.5342788696289
2019	75.3675994873047