Year	% of cohort
1971	71.633918762207
1972	85.2393112182617
1973	84.5203170776367
1974	87.4612121582031
1975	87.5038299560547
1976	87.6916885375977
1977	86.8861999511719
1980	87.1469497680664
1981	88.8629379272461
1982	90.1907196044922
1983	91.6368408203125
1984	92.623161315918
1985	92.5876235961914
1986	94.0180435180664
1987	92.926872253418
1988	91.0349578857422
1989	89.7929229736328
1990	90.3265075683594
1991	91.5756072998047
1992	94.0229873657227
1993	94.9275207519531
1994	93.7231521606445
1998	77.7079925537109
1999	95.6468276977539
2000	96.669921875
2001	97.3898010253906
2002	97.2356109619141
2003	96.9423675537109
2004	96.9366836547852
2005	97.0006332397461
2006	96.8172302246094
2007	96.4706115722656
2008	95.9206008911133
2009	96.59765625
2010	95.9193496704102
2011	96.5003890991211
2012	96.6864471435547
2013	96.6695404052734
2014	95.9751968383789
2015	96.2500076293945
2016	96.3048706054688
2017	96.7101287841797
2018	96.8225631713867
2019	96.2527236938477
2020	97.2796325683594
2021	94.9814071655273