Year	% of cohort
1999	93.8994598388672
2000	98.152229309082
2001	93.5085830688477
2002	91.8917922973633
2003	97.8372116088867
2004	93.7594223022461
2005	92.0089492797852
2006	97.4632263183594
2007	92.7243118286133
2008	93.3484497070312
2010	93.5806503295898
2011	96.2779235839844
2013	93.7780075073242
2015	86.7923126220703
2016	97.3294677734375
2017	88.4433975219727
2018	87.2070236206055
2019	87.1870422363281
2020	87.1530532836914
2021	94.7359008789062