Year	% of cohort
1999	91.8206329345703
2000	95.5613403320312
2001	94.4944686889648
2002	96.0822296142578
2003	96.2938919067383
2004	97.4918823242188
2005	93.3095626831055
2006	92.7071380615234
2007	93.584846496582
2008	92.1787109375
2009	93.3313064575195
2010	94.4611892700195
2020	95.1376876831055
2021	96.4392166137695