Year	% of cohort
1971	87.4984817504883
1972	89.4411315917969
1973	89.9300079345703
1975	90.2445297241211
1976	91.9608688354492
1977	94.8166580200195
1978	92.9790115356445
1979	89.5483779907227
1980	90.1365585327148
1983	91.2605590820312
1984	89.1836624145508
1985	90.1588363647461
1991	80.812370300293
1994	83.8659210205078
1995	80.2257232666016
1996	87.6944808959961
1997	87.1031799316406
1998	86.5399398803711
1999	82.1000289916992
2000	86.0980606079102
2001	83.5264892578125
2003	92.7926864624023
2007	91.0227279663086
2008	90.9447708129883
2011	96.5088272094727
2012	97.1547622680664
2015	91.2171936035156
2019	74.3819732666016