Year	% of cohort
2009	85.1734008789062
2010	86.8091735839844
2011	90.0369491577148
2012	96.4350128173828
2013	93.936767578125
2014	96.0024795532227
2015	94.621223449707
2016	93.8127517700195
2017	94.7941513061523
2018	97.4247894287109
2019	95.3442993164062
2021	97.2886734008789