Year	% of cohort
2000	98.5505981445312
2001	99.8623504638672
2002	95.837760925293
2003	98.1457138061523
2004	98.3880615234375
2005	97.927116394043
2006	99.0175399780273
2007	97.2434692382812
2008	97.8307571411133
2009	99.6590270996094
2010	97.8422012329102
2011	98.1046676635742
2012	97.5717926025391
2013	98.8694534301758
2014	97.6818466186523
2015	98.707893371582
2016	98.7586288452148
2017	98.7482833862305
2018	97.0938568115234
2019	99.6440277099609
2020	97.1911697387695