Year	% of cohort
1971	95.773063659668
1972	98.0971984863281
1973	97.0292892456055
1974	63.2939414978027
1975	94.7014312744141
1976	99.2046966552734
1977	99.1430587768555
1978	98.6559677124023
1979	98.4959411621094
1980	99.8519897460938
1981	96.4157562255859
1982	99.9054794311523
1983	98.6072387695312
1984	98.6309585571289
1985	98.596549987793
1986	98.5589294433594
1987	99.5973815917969
1988	99.6987533569336
1989	98.3216705322266
1991	99.3599319458008
1992	98.7292175292969
1993	98.9117889404297
1994	98.9836807250977
1999	93.6343231201172
2000	98.8756866455078
2002	97.3209762573242
2003	99.974853515625
2004	98.5601501464844
2005	97.6990737915039
2006	98.9853820800781
2007	93.8682403564453
2012	92.8857727050781
2013	89.9588088989258
2014	98.1687927246094
2015	97.7002334594727
2016	98.5138778686523
2019	95.4127426147461
2020	100