Year	% of cohort
2008	77.8721237182617
2009	70.2752532958984
2010	85.135139465332
2011	80.0028533935547
2012	80.0265731811523
2013	84.9907608032227
2014	83.5339736938477
2015	82.3895111083984
2016	85.7708435058594
2018	93.8079071044922