Year	% of cohort
1977	87.543571472168
1984	94.178108215332
1985	88.9210510253906
1986	93.2485580444336
1987	93.9744873046875
1988	96.4318008422852
1989	93.5270233154297
1990	93.1589431762695
1991	93.5102996826172
1992	94.3772811889648
1993	92.8547515869141
1994	94.680908203125
1995	96.4396209716797
1996	93.1715469360352
1997	99.6353988647461
1998	84.4459533691406
2000	87.4327087402344
2001	91.3380966186523
2002	86.56640625
2003	89.5756225585938
2004	93.6220932006836
2005	91.7258911132812
2006	92.6938781738281
2007	92.9527282714844
2008	93.9156723022461
2009	93.6036376953125
2010	92.6936187744141
2011	99.0658874511719
2012	98.4866561889648
2013	98.8046569824219
2014	98.4772491455078
2015	99.3595275878906
2019	99.1812133789062
2020	98.6107406616211