Year	% of cohort
1988	95.4890518188477
1989	94.5384826660156
1990	95.0576782226562
1991	95.6911315917969
1992	95.3501281738281
1993	95.9253005981445
1994	93.6282501220703
1995	97.3712692260742
1996	94.6217880249023
1997	92.900520324707
1998	97.5030899047852
1999	96.8336181640625
2000	97.1402893066406
2001	96.9915924072266
2002	97.4064407348633
2003	97.4869003295898
2004	97.2682418823242
2005	96.9881210327148
2006	96.3731231689453
2007	96.4000091552734
2008	96.4753036499023
2009	98.2660293579102
2010	97.3775405883789
2011	97.2907333374023
2012	97.0010986328125
2013	97.1211624145508
2014	97.3495101928711
2015	97.1654891967773
2016	95.9154510498047
2017	98.0415191650391
2018	98.1235809326172
2019	98.3355407714844
2020	98.6365509033203
2021	98.6223831176758