Year	% of cohort
1977	82.4963302612305
1984	92.2618713378906
1985	84.1152725219727
1986	90.1071166992188
1987	90.4270172119141
1988	92.1042404174805
1989	91.1804504394531
1990	90.4350967407227
1991	90.1677627563477
1992	91.2471237182617
1993	89.2083435058594
1994	92.3991165161133
1995	94.3664779663086
1996	91.2909774780273
1997	99.6353988647461
1998	80.9642028808594
2000	85.4886703491211
2001	90.1875610351562
2002	84.7282867431641
2003	87.7356567382812
2004	92.0787506103516
2005	90.8148498535156
2006	91.8807525634766
2007	92.627311706543
2008	93.5349502563477
2009	93.5323181152344
2010	92.6936187744141
2011	99.0658874511719
2012	98.4016571044922
2013	98.8046569824219
2014	98.4772491455078
2015	99.3595275878906
2019	98.7694931030273
2020	98.2613525390625