Year	% of cohort
1971	75.3932800292969
1972	89.2721405029297
1973	89.7843017578125
1974	88.372802734375
1975	88.9966125488281
1976	89.5616989135742
1977	88.6071701049805
1978	94.0448532104492
1979	95.6543197631836
1980	94.124397277832
1982	94.3177795410156
1983	98.1128005981445
1988	80.2845687866211
1989	95.6838531494141
1993	98.5544967651367
1999	96.9998626708984
2002	97.4650802612305
2003	98.2225494384766
2004	95.5223922729492
2006	95.5346527099609
2010	99.3273086547852
2017	98.725830078125
2018	97.1242904663086
2019	96.2302093505859
2020	97.9316635131836
2021	99.5245895385742