Year	% of cohort
2006	96.0760803222656
2007	95.9608993530273
2008	96.1654663085938
2009	95.7283630371094
2010	94.9269409179688
2011	92.5448989868164
2012	93.8363876342773
2013	94.6479110717773
2014	96.0980682373047
2015	97.3743896484375
2016	97.1077880859375
2017	97.5210800170898
2018	97.216682434082
2019	97.399772644043
2020	98.8109970092773
2021	95.8122024536133