Year	% of cohort
2004	92.9134368896484
2008	90.6960067749023
2009	93.4835205078125
2010	90.0008392333984
2011	90.9936218261719
2013	90.2666091918945
2016	90.2032470703125
2017	88.7043914794922
2018	93.058952331543
2019	93.5733184814453