Year	% of cohort
1970	91.9517211914062
1971	91.8777923583984
1972	92.1960296630859
1973	92.3611679077148
1974	92.3584518432617
1975	92.6045303344727
1976	92.9627914428711
1977	93.4732208251953
1978	93.4149703979492
1979	93.2220001220703
1980	93.6230621337891
1981	94.0677490234375
1982	93.662841796875
1983	94.2925796508789
1984	95.1181182861328
1985	95.2873687744141
1986	94.5244216918945
1987	94.0627517700195
1988	94.8125991821289
1989	95.2932891845703
1990	95.4147872924805
1991	95.4958190917969
1992	95.4089126586914
1993	95.6200332641602
1994	95.6741104125977
1995	95.9147491455078
1996	96.0077285766602
1997	96.0263977050781
1998	96.132682800293
1999	96.1855087280273
2000	96.404899597168
2001	96.5521621704102
2002	96.712272644043
2003	97.1285095214844
2004	97.3152694702148
2005	97.0823974609375
2006	97.0173873901367
2007	96.6334609985352
2008	96.7104568481445
2009	96.1823272705078
2010	96.5893096923828
2011	96.4615173339844
2012	96.1858062744141
2013	96.3669967651367
2014	96.6239776611328
2015	96.9860229492188
2016	97.254280090332
2017	97.2226486206055
2018	97.2821426391602
2019	97.2891082763672
2020	97.2098617553711
2021	97.2144470214844