Year	% of cohort
1973	87.4245529174805
1974	87.1487731933594
1979	87.1976623535156
1980	95.6384811401367
1981	97.2658920288086
1982	95.5761184692383
1983	97.077751159668
1984	96.8899383544922
1985	96.8174819946289
1986	92.8726425170898
1987	94.4512634277344
1991	91.2655792236328
1993	93.2791976928711
1996	98.5821990966797
1999	95.5921173095703
2000	90.3182830810547
2001	98.5037994384766
2002	97.0955123901367
2003	86.3382034301758
2008	96.5572662353516
2010	94.6645278930664
2015	96.8248672485352
2017	97.1082382202148
2020	95.0551223754883