Year	% of cohort
1971	85.5455093383789
1972	86.497428894043
1973	81.2822494506836
1974	78.0585174560547
1975	84.9301986694336
1976	80.2858123779297
1977	78.5106811523438
1978	82.8591384887695
1979	83.0474472045898
1980	83.3075408935547
1981	88.0987014770508
1982	87.8563919067383
1983	90.6215515136719
1984	93.8832778930664
1985	95.2006683349609
1988	90.6352386474609
1989	89.0062408447266
1990	93.0230102539062
1991	92.803108215332
1992	91.7368774414062
1993	90.8373565673828
1994	89.0609283447266
1995	89.8365325927734
1996	94.2859420776367
1997	88.9931411743164
1999	91.4972763061523
2000	91.9664611816406
2001	91.779670715332
2020	75.0566101074219
2021	91.1982498168945
2022	94.7371368408203