Year	% of cohort
1991	67.4140777587891
1994	70.4300994873047
1995	70.0554428100586
1999	76.0945205688477
2000	84.5291900634766
2005	91.0416030883789
2006	87.3378677368164
2007	92.6937103271484
2008	95.5822067260742
2009	91.1053237915039
2010	91.9557800292969
2012	93.5623779296875
2013	96.4191818237305
2014	99.1287078857422
2016	94.7656021118164
2017	96.3317184448242
2019	93.0183029174805
2020	96.8110122680664