Year	% of cohort
1971	75.3600463867188
1972	87.5919723510742
1973	89.4071807861328
1974	86.7136993408203
1975	86.6767196655273
1976	88.9104309082031
1977	90.0399169921875
1978	89.4939575195312
1979	92.8485794067383
1980	91.9867782592773
1982	87.7267837524414
1983	95.3658065795898
1988	90.205680847168
1989	95.9394607543945
1993	96.0036697387695
1999	96.5450286865234
2002	95.050651550293
2003	97.3878631591797
2004	95.6318969726562
2006	92.9974517822266
2010	97.0425872802734
2017	94.7931365966797
2018	94.5385818481445
2019	92.4655532836914
2020	97.4467926025391
2021	97.0048522949219