Year	% of cohort
1994	98.3944931030273
1995	98.1359405517578
1996	99.4784469604492
1998	99.4722213745117
1999	99.3970794677734
2000	99.5130615234375
2001	99.5380783081055
2002	99.5516510009766
2005	99.4961929321289
2006	99.4534912109375
2007	98.1436309814453
2008	98.9501800537109
2009	99.0561370849609
2010	99.3033218383789
2011	99.4395370483398
2012	99.2546920776367
2013	97.8506698608398
2014	99.0114135742188
2015	97.3846664428711
2016	97.0408477783203
2017	96.7149963378906
2018	98.3523788452148
2019	98.4662628173828
2020	98.4870834350586