Year	% of cohort
2008	79.4592895507812
2009	70.5252227783203
2010	84.2046966552734
2011	79.3106384277344
2012	80.7667999267578
2013	84.5103378295898
2014	85.5425415039062
2015	83.83203125
2016	86.2657165527344
2018	93.2662582397461