Year	% of cohort
1981	74.4628372192383
1982	75.4721984863281
1983	75.947151184082
1984	75.0587921142578
1985	76.1064987182617
1986	76.5840682983398
1987	76.2357025146484
1988	76.8511505126953
1989	76.8245315551758
1990	80.1411819458008
1991	81.4257888793945
1992	82.2760467529297
1993	83.8533172607422
1994	84.9505386352539
1995	86.6882400512695
1996	87.2990188598633
1997	87.5476989746094
1998	87.3217468261719
1999	87.4860534667969
2000	87.9388732910156
2001	89.0343475341797
2002	89.0984878540039
2003	88.6846466064453
2004	88.5222015380859
2005	88.7677383422852
2006	89.087028503418
2007	89.0773086547852
2008	90.5572280883789
2009	91.4463806152344
2010	91.1986083984375
2011	90.9374237060547
2012	89.9253921508789
2013	90.3925933837891
2014	91.1732635498047
2015	92.0980529785156
2016	93.4594421386719
2017	93.800666809082
2018	94.2210998535156
2019	94.3076400756836
2020	94.4712295532227
2021	94.4417266845703