Year	% of cohort
1971	95.773063659668
1972	99.0848693847656
1973	97.8285980224609
1974	68.873908996582
1975	94.7014312744141
1976	99.2046966552734
1977	99.1430587768555
1978	99.0968399047852
1979	98.6768798828125
1980	99.8950729370117
1981	97.1175918579102
1982	99.9054794311523
1983	98.6619262695312
1984	98.6309585571289
1985	98.9932022094727
1986	98.5589294433594
1987	99.5973815917969
1988	99.6987533569336
1989	98.3216705322266
1991	99.4527206420898
1992	98.919921875
1993	98.9117889404297
1994	98.9836807250977
1999	93.7858123779297
2000	98.8756866455078
2001	98.1330108642578
2002	97.3209762573242
2003	99.974853515625
2004	99.5429611206055
2005	97.8611297607422
2006	98.9868698120117
2007	94.0666732788086
2012	93.4650497436523
2013	91.7151794433594
2014	98.1687927246094
2015	97.7002334594727
2016	98.5138778686523
2019	95.9654006958008
2020	100