Year	% of cohort
2004	67.8391723632812
2008	61.4878692626953
2009	63.6826400756836
2010	53.203929901123
2011	60.7665481567383
2012	63.603889465332
2013	83.5926971435547
2015	79.0270767211914
2017	73.6751022338867
2018	61.285888671875