Year	% of cohort
1988	95.7304000854492
1989	94.5176086425781
1990	95.4611206054688
1991	95.9656677246094
1992	95.7705001831055
1993	96.7720031738281
1994	94.2296676635742
1995	97.7736282348633
1996	95.0113983154297
1997	93.4160766601562
1998	97.9043502807617
1999	97.7264099121094
2000	97.5233306884766
2001	97.5491027832031
2002	97.7738037109375
2003	98.0877380371094
2004	97.9362869262695
2005	97.398551940918
2006	96.8281707763672
2007	96.7734527587891
2008	97.0698165893555
2009	98.439323425293
2010	97.658332824707
2011	97.4705505371094
2012	97.0856399536133
2013	97.4090576171875
2014	97.495979309082
2015	97.5324630737305
2016	96.3702392578125
2017	98.119873046875
2018	98.1337585449219
2019	98.4261016845703
2020	98.6771087646484
2021	98.6618881225586