Year	% of cohort
1978	66.8580932617188
1980	43.5838012695312
1983	42.246208190918
1984	52.2355690002441
1986	49.9953384399414
1987	48.6075096130371
1999	75.6925888061523
2001	79.3023071289062
2002	70.6483688354492
2003	82.9957504272461
2004	83.3832778930664
2005	79.5688171386719
2007	81.377311706543
2008	85.175178527832
2009	82.8951721191406
2010	86.5748596191406
2011	67.6807098388672