Year	% of cohort
1970	90.4348068237305
1973	88.7709426879883
1974	89.0534515380859
1975	81.2779998779297
1979	86.3679733276367
1980	94.6417694091797
1981	95.3358993530273
1982	93.657470703125
1983	95.3906707763672
1984	97.4881210327148
1985	94.8759002685547
1986	92.8842086791992
1987	92.7152404785156
1988	93.7890090942383
1991	90.3232727050781
1992	92.5926208496094
1993	91.837287902832
1996	94.1266326904297
1997	91.4899520874023
1999	96.1042709350586
2000	89.8736190795898
2001	97.2073516845703
2002	97.9179229736328
2003	84.8789367675781
2008	92.0371627807617
2010	93.9764633178711
2015	96.8165588378906
2017	96.2939529418945
2018	95.9835891723633
2019	95.5142669677734
2020	95.0244827270508
2021	95.6190719604492