Year	% of cohort
2001	96.2881927490234
2004	99.5040969848633
2005	99.87548828125
2006	99.9451522827148
2007	99.6919021606445
2008	99.9863662719727
2009	99.8172073364258
2010	99.006477355957
2011	100
2012	99.653450012207
2013	99.4032363891602
2014	99.3024368286133
2015	99.2555694580078
2016	99.7115631103516
2017	99.8126907348633
2018	99.8636932373047
2019	99.900032043457
2020	99.3824920654297