Year	% of cohort
2008	74.1743316650391
2009	66.6220474243164
2010	83.5591430664062
2011	78.1721496582031
2012	77.2995071411133
2013	81.2276000976562
2014	82.3003005981445
2015	80.549201965332
2016	82.8945388793945
2018	89.7812194824219