Year	% of cohort
1981	50.0995712280273
1986	52.3950691223145
1987	46.3258094787598
1988	31.098819732666
1993	58.1259689331055
1994	51.1006202697754
1995	55.2601089477539
1998	49.0251083374023
1999	56.4968109130859
2000	64.6218566894531
2001	60.4447212219238
2002	56.0096015930176
2003	53.6400985717773
2004	68.7515335083008
2005	65.5521697998047
2006	64.3769912719727
2007	50.8443908691406
2008	45.6620101928711
2009	43.4441909790039
2010	48.6313400268555
2011	44.1235389709473
2014	44.1405410766602