Year	% of cohort
1999	93.1766891479492
2001	93.8675765991211
2002	97.1067123413086
2003	94.925910949707
2004	95.3983993530273
2005	92.941780090332
2008	94.6210403442383
2010	97.6964721679688
2020	92.4057312011719
2021	95.4832000732422