Year	% of cohort
1971	91.1467895507812
1972	90.8566970825195
1973	91.0459594726562
1974	90.9562377929688
1975	88.3131103515625
1976	92.8324890136719
1977	84.5325317382812
1978	86.7746887207031
1979	89.3139114379883
1980	93.2563705444336
1981	96.6737518310547
1983	94.8214492797852
1984	96.4330825805664
1985	95.147102355957
1989	86.8734130859375
1992	90.5577774047852
1993	94.8738708496094
1994	91.9829406738281
1995	95.9750518798828
2005	85.1920928955078
2007	93.6134567260742
2012	97.7395782470703
2015	98.4795227050781
2016	96.194221496582
2017	97.2761383056641
2018	87.3271484375
2019	94.2446670532227
2020	84.8190078735352
2021	94.7297286987305