Year	% of cohort
1970	84.7241592407227
1971	84.3920516967773
1972	84.2771606445312
1973	83.6211929321289
1974	83.8604278564453
1975	84.5585632324219
1976	86.5798492431641
1977	86.0675964355469
1978	87.2748718261719
1979	86.6886520385742
1980	86.8768692016602
1981	87.3722915649414
1982	89.0826721191406
1983	89.3185806274414
1984	89.6194305419922
1985	90.0912322998047
1986	89.8506317138672
1987	89.3625869750977
1988	89.6176223754883
1989	88.8865737915039
1990	89.7963333129883
1991	90.9519195556641
1992	89.9441375732422
1993	90.4949493408203
1994	90.6320266723633
1995	91.9057769775391
1996	91.5567092895508
1997	91.6881103515625
1998	92.3239898681641
1999	92.1013412475586
2000	91.8458786010742
2001	92.6353073120117
2002	93.3373870849609
2003	93.6151733398438
2004	94.1620407104492
2005	94.5808715820312
2006	94.7572174072266
2007	94.2450790405273
2008	94.3861694335938
2009	94.8310775756836
2010	94.6848297119141
2011	94.3461990356445
2012	93.4442672729492
2013	94.6806793212891
2014	94.6060180664062
2015	95.0125503540039
2016	95.9947280883789
2017	95.7793884277344
2018	96.3404388427734
2019	96.2010879516602
2020	95.6039276123047
2021	95.5739822387695