Year	% of cohort
1978	63.9364013671875
1980	39.3564414978027
1983	37.8527412414551
1984	38.6708297729492
1986	42.528450012207
1987	43.0102806091309
1999	66.3412094116211
2001	79.9932098388672
2002	70.5167770385742
2003	82.15087890625
2004	84.7131576538086
2005	75.6911163330078
2007	79.4581909179688
2008	81.1929931640625
2009	78.6828765869141
2010	77.0793914794922
2011	63.5465393066406