Year	% of cohort
1970	83.9147262573242
1971	85.1464004516602
1972	90.4187316894531
1973	76.3563690185547
1977	86.3357391357422
1984	94.0354080200195
1985	85.9533386230469
1986	91.8045501708984
1987	92.3539199829102
1988	93.5389404296875
1989	93.5410614013672
1990	92.2981185913086
1991	92.2307281494141
1992	93.0757217407227
1993	91.4459609985352
1994	93.9555206298828
1995	95.7882232666016
1996	92.8398818969727
1997	93.5387802124023
1998	85.2100830078125
2000	86.6645812988281
2001	92.1150436401367
2002	86.9829330444336
2003	89.5611877441406
2004	93.651496887207
2005	92.4457778930664
2006	93.5836715698242
2007	94.306510925293
2008	95.1784133911133
2009	94.7436370849609
2010	94.0424118041992
2011	99.2045669555664
2012	98.980583190918
2013	99.1559371948242
2014	98.8020172119141
2015	99.5158386230469
2016	88.5581436157227
2019	98.939323425293
2020	98.7464294433594