Year	% of cohort
2004	69.6764526367188
2008	60.7506790161133
2009	61.5074310302734
2010	52.2056503295898
2011	60.9919509887695
2012	62.3696098327637
2013	79.5898895263672
2015	77.270637512207
2017	70.4091873168945
2018	65.2878494262695