Year	% of cohort
1971	66.4407730102539
1972	83.4457931518555
1973	84.2998428344727
1974	83.0056686401367
1975	84.3227386474609
1976	84.1692733764648
1977	83.3907012939453
1978	89.3867568969727
1979	91.1233062744141
1980	89.1737899780273
1982	91.1760406494141
1983	95.9764404296875
1988	76.08984375
1989	92.5491180419922
1993	96.7756195068359
1999	96.4041213989258
2002	96.1300506591797
2003	97.0226287841797
2004	95.1462020874023
2006	93.8492431640625
2010	98.8163681030273
2017	97.0688323974609
2018	96.1112594604492
2019	94.9493026733398
2020	97.4426803588867
2021	98.786506652832