Year	% of cohort
2001	95.3816909790039
2004	99.9063262939453
2005	98.9623031616211
2006	99.0826034545898
2007	99.466796875
2008	99.3563232421875
2009	99.4772033691406
2010	100
2011	98.7138671875
2012	98.2747421264648
2013	99.4317092895508
2014	99.0563888549805
2015	99.2194595336914
2016	99.7953796386719
2017	99.7196197509766
2018	99.7698364257812
2019	99.8354263305664
2020	98.9567413330078