Year	% of cohort
1995	99.3299179077148
1996	99.4429626464844
1999	98.6778564453125
2000	97.816291809082
2001	97.6145324707031
2002	97.9156036376953
2003	97.9846725463867
2004	97.362922668457
2006	98.5291900634766
2007	97.8749771118164
2010	96.2530136108398
2011	99.2999420166016
2012	96.4719390869141
2013	97.5301284790039
2014	96.9154281616211
2015	98.2781600952148
2016	98.8515625
2018	95.8835983276367
2019	99.0070571899414
2020	98.6717834472656
2021	98.8187408447266