Year	% of cohort
1994	98.8138275146484
2001	95.8305587768555
2002	96.3115921020508
2003	95.801513671875
2004	96.4375381469727
2005	98.1804580688477
2006	96.3584976196289
2007	96.8297882080078
2008	95.5992736816406
2009	97.0167007446289
2010	95.144416809082
2011	96.3750305175781
2012	95.1258163452148
2013	94.5923461914062
2014	94.8386001586914
2015	96.0871505737305
2016	94.2689514160156
2017	94.757942199707
2018	90.2189788818359
2019	97.1116409301758
2020	97.1222305297852
2021	96.0628280639648