Year	% of cohort
1971	97.0878372192383
1972	97.3377380371094
1973	96.245246887207
1974	66.1131286621094
1975	94.2327499389648
1976	96.7526702880859
1977	98.9908218383789
1978	99.2225189208984
1979	98.7504730224609
1980	97.8641662597656
1981	100
1982	98.5818405151367
1983	99.0042419433594
1984	98.5873489379883
1985	98.9598999023438
1986	97.8165893554688
1987	98.4839782714844
1988	97.8031463623047
1989	99.7130508422852
1991	99.1834335327148
1992	99.1932067871094
1993	98.9071502685547
1994	99.8108367919922
1999	96.2937088012695
2000	98.7372665405273
2002	98.6446304321289
2003	97.2535781860352
2004	97.713752746582
2005	99.6594696044922
2006	98.7766571044922
2007	96.7720794677734
2012	95.9889526367188
2013	91.7763900756836
2014	97.0143966674805
2015	98.5925827026367
2016	99.0222778320312
2019	99.1409606933594
2020	96.0702896118164