Year	% of cohort
2008	97.3762893676758
2009	99.1901016235352
2010	98.2857818603516
2011	98.3551330566406
2012	97.7548370361328
2013	97.7676162719727
2014	97.9014129638672
2015	97.7325286865234
2016	93.4422607421875
2017	99.6366119384766
2018	99.6196670532227
2021	99.8285369873047