Year	% of cohort
1970	50.5566711425781
1971	61.0620384216309
1972	66.6201171875
1973	65.0093078613281
1974	62.2791404724121
1975	59.2272300720215
1976	61.3572311401367
1977	59.3374404907227
1978	60.2568702697754
1979	62.2218399047852
1980	68.6753768920898
1981	62.4111785888672
1982	63.0094184875488
1983	65.4896011352539
1984	65.9735565185547
1985	60.8803482055664
1986	68.4870223999023
1987	66.2890319824219
1988	60.9646606445312
1989	72.3508911132812
1990	64.5424194335938
1991	66.7932205200195
1992	66.7307510375977
1993	69.2509384155273
1994	75.5409469604492
1995	57.9665107727051
1996	65.0070114135742
1997	67.1848373413086
1998	71.559440612793
1999	64.6514892578125
2000	58.543628692627
2001	57.4692306518555
2002	61.2730598449707
2004	71.1828231811523
2005	83.0193862915039
2006	71.70166015625
2009	83.910888671875
2010	67.3093719482422
2011	69.3380432128906
2012	74.7054061889648
2013	78.4520263671875
2014	79.077507019043
2015	80.3237609863281
2016	84.3743362426758
2017	85.3693389892578
2018	83.2042236328125