Year	% of cohort
1981	76.3769378662109
1982	76.5430068969727
1983	76.9709777832031
1984	77.2888336181641
1985	77.8433990478516
1986	78.4268112182617
1987	78.0117874145508
1988	78.1748504638672
1989	78.3959503173828
1990	81.1898422241211
1991	81.7438278198242
1992	83.5645904541016
1993	84.8256912231445
1994	85.6189193725586
1995	86.8686676025391
1996	87.5542068481445
1997	87.8412322998047
1998	87.6649322509766
1999	87.9655609130859
2000	88.7404403686523
2001	89.2270431518555
2002	89.4101181030273
2003	89.1306228637695
2004	88.9271087646484
2005	88.7652130126953
2006	88.8744888305664
2007	89.0303497314453
2008	90.3307571411133
2009	91.4417877197266
2010	91.5820236206055
2011	91.8798980712891
2012	90.8365936279297
2013	90.7721176147461
2014	92.1526794433594
2015	93.4623031616211
2016	94.7146072387695
2017	95.341682434082
2018	95.6677017211914
2019	95.8031463623047
2020	95.7185592651367
2021	95.6787414550781