Year	% of cohort
1994	99.6748809814453
1999	99.5315475463867
2000	97.7405700683594
2001	97.7190628051758
2002	96.8438873291016
2003	97.4310684204102
2004	98.615608215332
2005	98.4248199462891
2006	98.9451522827148
2007	98.4190521240234
2008	98.3747329711914
2009	99.730583190918
2010	98.0783233642578
2011	98.687858581543
2012	98.1919326782227
2013	99.1825485229492
2014	98.3215713500977
2015	99.2061004638672
2016	99.1685180664062
2017	99.2765502929688
2018	98.3101501464844
2019	99.7092590332031
2020	98.0887298583984