Year	% of cohort
1971	71.3947372436523
1972	85.7947998046875
1973	87.1554870605469
1974	85.0537719726562
1975	85.5947189331055
1976	86.6996612548828
1977	86.8995590209961
1978	89.4632110595703
1979	92.0447311401367
1980	90.6574478149414
1981	93.7595520019531
1982	89.3532867431641
1983	95.6609878540039
1988	82.9971084594727
1989	94.2793502807617
1992	96.0296020507812
1993	96.3778305053711
1999	96.4773864746094
2002	95.578369140625
2003	97.2129287719727
2004	95.3918304443359
2006	93.4258117675781
2010	97.8990631103516
2017	95.8970336914062
2018	95.3061904907227
2019	93.6752014160156
2020	97.4441604614258
2021	97.8711929321289