Year	% of cohort
1985	94.7587966918945
1986	95.4838714599609
1987	94.6004028320312
1988	96.2426605224609
1989	81.4940338134766
1990	96.1703109741211
1991	92.1006164550781
1992	90.9499893188477
1993	91.2732467651367
1995	93.4361801147461
1996	89.2324371337891
1997	89.2161712646484
1998	90.5046081542969
1999	93.2533874511719
2000	94.7199478149414
2001	92.8246612548828
2002	93.6456298828125
2003	94.252799987793
2004	93.2094573974609
2005	94.6079330444336
2006	94.345817565918
2007	94.1452178955078
2008	93.5460586547852
2009	97.1029510498047
2010	96.450309753418
2011	96.378547668457
2012	95.7928771972656
2013	98.2072677612305
2014	96.1510314941406
2015	93.4187164306641
2016	94.5932998657227
2017	96.2631607055664
2018	95.6638488769531
2019	96.0557632446289
2020	97.1132965087891