Year	% of cohort
2008	97.749153137207
2009	99.5094909667969
2010	98.7925415039062
2011	98.5889205932617
2012	97.7603073120117
2013	97.8756637573242
2014	97.9974670410156
2015	98.2876129150391
2016	94.3692474365234
2017	99.5956802368164
2018	99.4494018554688
2021	100