Year	% of cohort
1986	97.2142562866211
1987	96.5128021240234
1988	96.8492965698242
1989	99.0677795410156
1990	99.6490707397461
1991	99.5418014526367
1992	99.1939163208008
1993	99.2404403686523
1994	99.5587615966797
1995	99.4224319458008
1997	99.8347702026367
1998	99.478271484375
1999	99.6416625976562
2000	98.7608108520508
2001	99.4553527832031
2002	99.7704086303711
2003	99.749153137207
2004	98.9789810180664
2005	98.8804473876953
2006	99.8322830200195
2007	99.3993682861328
2008	99.7176284790039
2009	99.5568618774414
2010	99.9788665771484
2011	99.415412902832
2012	99.4246978759766
2013	99.4967803955078
2014	99.7293395996094
2015	99.7072906494141
2016	99.6484222412109
2017	99.8414077758789
2018	99.8764266967773
2019	99.7081069946289
2020	99.6482086181641
2021	99.1006088256836