Year	% of cohort
2004	72.3636932373047
2008	59.8198509216309
2009	58.8606605529785
2010	50.9544715881348
2011	61.2874412536621
2012	60.8554306030273
2013	74.8208465576172
2015	75.0952835083008
2017	66.5066833496094
2018	70.6304092407227