Year	% of cohort
1993	99.9436874389648
1998	97.3833770751953
1999	96.9687576293945
2000	97.2664794921875
2001	98.494270324707
2005	97.5586929321289
2006	98.5013122558594
2007	98.4120864868164
2008	97.9267425537109
2009	98.1269607543945
2010	98.6259307861328
2011	98.5529937744141
2012	99.2331771850586
2013	99.1460266113281
2014	68.1746368408203
2015	95.7141189575195
2016	98.4429779052734
2017	98.8921203613281
2018	98.3361968994141
2019	98.684196472168
2020	98.7282104492188