Year	% of cohort
2000	96.9062805175781
2001	95.5140533447266
2002	97.9167022705078
2003	96.6948471069336
2004	98.8600082397461
2005	98.9535293579102
2006	98.8709869384766
2007	99.6794662475586
2008	98.9556121826172
2009	99.8070831298828
2010	98.3339614868164
2011	99.3146514892578
2012	98.8586502075195
2013	99.5171203613281
2014	99.0073699951172
2015	99.7412261962891
2016	99.6093063354492
2017	99.8449783325195
2018	99.6270370483398
2019	99.78076171875
2020	99.063362121582