Year	% of cohort
1971	81.8075714111328
1972	92.0178985595703
1973	92.4736633300781
1974	89.9992065429688
1975	90.2534103393555
1976	91.7743301391602
1977	93.3002700805664
1978	93.0907897949219
1979	95.6299667358398
1980	95.1949081420898
1982	90.7487030029297
1983	96.8627395629883
1988	93.2115173339844
1989	98.2649765014648
1993	98.168212890625
1999	97.5996398925781
2002	96.3211135864258
2003	98.1428985595703
2004	96.9070892333984
2006	92.9974517822266
2010	97.6725387573242
2017	95.8956680297852
2018	95.8949584960938
2019	94.5065994262695
2020	97.9079208374023
2021	97.7413787841797