Year	% of cohort
1999	85.4539031982422
2000	86.2389068603516
2001	85.4195175170898
2002	83.6509628295898
2003	83.5593032836914
2004	92.2760314941406
2005	89.1652603149414
2006	89.3319931030273
2007	92.2759094238281
2008	89.742919921875
2009	89.8677978515625
2010	93.765007019043
2011	89.7380599975586
2012	93.9019165039062
2013	89.6745834350586
2014	83.6187973022461
2015	77.9956893920898
2021	93.0233383178711