Year	% of cohort
2008	76.3391723632812
2009	67.7426910400391
2010	83.3094635009766
2011	77.7969665527344
2012	78.8567199707031
2013	81.9001235961914
2014	85.2796936035156
2015	82.9307708740234
2016	84.2905502319336
2018	90.5164337158203