Year	% of cohort
1970	92.6253204345703
1971	92.6587371826172
1972	92.7977523803711
1973	93.0378570556641
1974	93.38720703125
1975	93.4082565307617
1976	93.3747863769531
1977	93.8009033203125
1978	93.8737487792969
1979	93.812858581543
1980	93.5659866333008
1981	93.4402236938477
1982	93.4015426635742
1983	93.3525238037109
1984	93.5855484008789
1985	93.6011581420898
1986	93.4668884277344
1987	93.3540420532227
1988	93.5656433105469
1989	93.4897918701172
1990	94.0482330322266
1991	94.3940963745117
1992	94.4826507568359
1993	94.4948425292969
1994	94.3910675048828
1995	94.1897506713867
1996	93.9897537231445
1997	94.1239318847656
1998	94.3465270996094
1999	94.4343185424805
2000	94.5228576660156
2001	94.5956192016602
2002	94.6817398071289
2003	94.6989135742188
2004	94.7846527099609
2005	94.7711334228516
2006	94.7247772216797
2007	94.5829315185547
2008	94.6479263305664
2009	94.5487365722656
2010	94.552619934082
2011	94.5712814331055
2012	94.6071319580078
2013	94.6604919433594
2014	93.6845474243164
2015	94.6252899169922
2016	94.901123046875
2017	94.8628692626953
2018	95.0975189208984
2019	95.0913391113281
2020	93.9157791137695
2021	93.7744064331055