Year	% of cohort
1970	92.7779235839844
1971	92.7205810546875
1972	92.9681015014648
1973	93.1639099121094
1974	93.3792877197266
1975	93.6589736938477
1976	93.8789367675781
1977	94.3003082275391
1978	94.2030792236328
1979	94.2111206054688
1980	94.5813674926758
1981	94.9000778198242
1982	94.5970764160156
1983	95.0508270263672
1984	95.6196823120117
1985	95.7397689819336
1986	95.1974411010742
1987	94.8275985717773
1988	95.1553497314453
1989	95.1737823486328
1990	95.4951324462891
1991	95.6779479980469
1992	95.7215881347656
1993	96.0356521606445
1994	95.351676940918
1995	96.4849624633789
1996	95.7180633544922
1997	95.2376708984375
1998	96.6070938110352
1999	96.5225067138672
2000	96.7230987548828
2001	96.7629318237305
2002	96.9255523681641
2003	97.2374267578125
2004	97.3051681518555
2005	97.0793228149414
2006	96.9180908203125
2007	96.6735916137695
2008	96.7807998657227
2009	96.7325210571289
2010	96.7927932739258
2011	96.7208099365234
2012	96.4678497314453
2013	96.6682662963867
2014	96.8960418701172
2015	97.1390991210938
2016	97.0940399169922
2017	97.4749984741211
2018	97.5390701293945
2019	97.5856704711914
2020	97.5758895874023
2021	97.5827102661133