Year	% of cohort
1970	84.7636871337891
1971	83.9805068969727
1972	83.905891418457
1973	83.25537109375
1974	83.489860534668
1975	84.2335433959961
1976	85.492919921875
1977	84.9962921142578
1978	86.0951309204102
1979	85.6118011474609
1980	85.6822128295898
1981	86.3629608154297
1982	87.9200820922852
1983	88.3060684204102
1984	88.2874069213867
1985	89.3389587402344
1986	89.1631927490234
1987	88.5226669311523
1988	88.8334884643555
1989	88.3587875366211
1990	89.1932983398438
1991	90.5324020385742
1992	89.4349212646484
1993	90.1737365722656
1994	89.8074111938477
1995	91.0585403442383
1996	90.5547866821289
1997	90.6286315917969
1998	91.1768569946289
1999	91.3948287963867
2000	91.12841796875
2001	91.9520568847656
2002	92.6505432128906
2003	92.9137573242188
2004	93.5282974243164
2005	93.7088394165039
2006	93.9224014282227
2007	93.4660186767578
2008	93.7284774780273
2009	94.2787475585938
2010	94.2631912231445
2011	93.8198089599609
2012	93.0205917358398
2013	94.1369781494141
2014	94.0946578979492
2015	94.2727279663086
2016	95.628532409668
2017	95.2472915649414
2018	95.8099212646484
2019	95.7731781005859
2020	95.2388076782227
2021	95.210090637207