Year	% of cohort
1979	92.7212600708008
1980	94.3516235351562
1983	93.7711181640625
1984	94.1969223022461
1985	95.5003204345703
1991	84.1892776489258
1994	92.2626266479492
1995	83.5140380859375
1996	93.8747634887695
1997	93.1317825317383
1998	92.6623992919922
1999	85.6725082397461
2000	92.5441284179688
2001	91.4114685058594
2003	94.7060394287109
2008	92.2230529785156
2011	98.1205368041992
2012	98.0109710693359
2015	93.1702194213867
2019	80.1056518554688