Year	% of cohort
1983	59.2419013977051
1984	52.3310203552246
1985	57.194408416748
1986	62.8209686279297
1987	63.132381439209
1988	65.5949478149414
1989	60.0445899963379
1990	78.693359375
1991	63.8915901184082
1992	84.4651718139648
1993	82.1371994018555
2003	86.322998046875
2004	78.10009765625
2005	81.551872253418
2006	85.564208984375
2007	73.9281387329102
2008	72.2665405273438
2009	74.2529678344727
2011	62.9045104980469
2012	67.4941024780273
2013	67.9662094116211