Year	% of cohort
1971	85.6924133300781
1972	90.6888580322266
1973	82.9213790893555
1974	85.3386688232422
1975	86.8977584838867
1976	84.1382904052734
1977	82.8449325561523
1978	86.748176574707
1979	82.2666015625
1980	85.3202819824219
1981	89.266357421875
1982	90.6228408813477
1983	92.3952331542969
1984	94.187141418457
1985	95.1223602294922
1988	87.9731292724609
1989	85.9834823608398
1990	95.5785598754883
1991	92.5171127319336
1992	87.1863174438477
1993	88.6066970825195
1994	84.9340667724609
1995	86.2820205688477
1996	89.3746719360352
1997	81.2934875488281
1999	87.0905380249023
2000	88.412239074707
2001	89.4702377319336
2003	91.578010559082
2004	93.5307693481445
2005	91.7953109741211
2006	94.6966323852539
2007	96.3603820800781
2008	92.79931640625
2009	94.3081665039062
2010	95.1182174682617
2011	92.9120101928711
2020	66.7947463989258
2021	86.173828125
2022	86.1461029052734