Year	% of cohort
1991	98.6819381713867
1992	91.3307495117188
1993	97.0281829833984
1994	96.8501510620117
1995	96.4400634765625
1996	96.252082824707
1998	97.5307464599609
1999	96.9302215576172
2000	97.2329711914062
2001	98.2171783447266
2002	97.6890182495117
2003	97.6352386474609
2004	97.3955383300781
2005	97.4480972290039
2006	97.8908920288086
2007	97.4140090942383
2008	97.7248687744141
2009	98.2195281982422
2010	98.1083602905273
2011	97.9527893066406
2012	98.205322265625
2013	97.901123046875
2014	98.9544982910156
2015	98.6890411376953
2016	98.8516082763672
2017	98.6843338012695
2018	98.4184265136719
2019	99.1936416625977
2020	99.5698013305664
2021	99.3288803100586