Year	% of cohort
1971	88.0467071533203
1982	72.5302124023438
1984	78.1846313476562
1985	64.4278411865234
1988	74.227180480957
1992	85.0276718139648
1993	80.4461135864258
1995	79.8239593505859
1996	78.2070007324219
1999	65.7956237792969
2000	72.997200012207
2001	62.0715217590332
2002	78.4760971069336
2003	78.4145202636719
2004	68.4128112792969
2005	67.7398681640625
2007	71.5396575927734
2010	67.4148330688477
2011	85.8504409790039
2012	76.5318298339844
2013	80.0716934204102
2014	80.9003677368164
2015	79.1796188354492
2018	86.9951019287109
2019	84.7079391479492
2020	81.2964477539062