Year	% of cohort
1982	94.4319915771484
1983	94.0680694580078
1984	93.8014526367188
1985	94.629638671875
1986	94.6115417480469
1987	95.1482009887695
1988	95.1093215942383
1989	94.9205169677734
1990	95.7741622924805
1991	96.9216537475586
1992	95.9147262573242
1993	95.3395462036133
1994	96.0785369873047
1995	96.0249328613281
1996	95.7582321166992
1997	95.4567413330078
1998	95.5567779541016
1999	95.6458892822266
2000	96.3804931640625
2001	96.5228118896484
2002	96.5080032348633
2003	96.5132675170898
2004	96.8986434936523
2005	97.2502212524414
2006	97.1291809082031
2007	96.1576766967773
2008	95.7394714355469
2009	97.9780807495117
2010	96.6008377075195
2011	95.4158706665039
2012	95.9074020385742
2013	96.5862579345703
2014	93.7136688232422
2015	97.172721862793
2016	98.3982696533203
2017	98.7713394165039
2018	98.8070068359375
2019	98.7875137329102
2020	98.7157821655273
2021	98.8159866333008