Year	% of cohort
1980	92.8687362670898
1981	94.5349197387695
1982	93.1341934204102
1983	93.5557479858398
1984	96.4483337402344
1985	95.5106735229492
1986	96.8249282836914
1987	92.8639297485352
1988	96.2154388427734
1989	96.9541778564453
2005	99.4023132324219
2008	99.4652862548828
2009	95.0715789794922
2010	97.7565383911133
2011	97.1474380493164
2012	95.94140625
2013	96.3360900878906
2014	97.4409103393555
2015	99.2785034179688
2016	99.8733673095703
2017	99.7530364990234
2018	99.8332214355469
2019	99.7798233032227
2020	99.884521484375