Year	% of cohort
1971	95.0906524658203
1972	95.3493194580078
1973	95.7742919921875
1974	95.4801788330078
1975	95.8283233642578
1976	95.600456237793
1977	96.8013381958008
1978	94.5407333374023
1979	96.5564804077148
1980	97.278678894043
1981	96.7101974487305
1982	97.1031188964844
1983	96.5971374511719
1984	96.9902191162109
1985	95.2047424316406
1986	96.2611770629883
1987	95.3271789550781
1988	96.3737106323242
1989	82.6257705688477
1990	94.9035034179688
1991	92.2221298217773
1992	91.2388687133789
1993	88.3217315673828
1994	91.5027008056641
1995	94.3404998779297
1996	89.443229675293
1997	88.9196472167969
1998	90.3453674316406
1999	92.9361801147461
2000	94.7232818603516
2001	92.7161026000977
2002	93.8706817626953
2003	93.6661987304688
2004	92.2518920898438
2005	94.8401336669922
2006	94.1241912841797
2007	93.6910781860352
2008	93.7774429321289
2009	97.3659820556641
2010	96.6375427246094
2011	96.9386520385742
2012	95.996696472168
2013	97.8439331054688
2014	96.1173934936523
2015	93.4926986694336
2016	94.4721374511719
2017	96.3589782714844
2018	95.8381881713867
2019	95.8348083496094
2020	97.5397491455078