Year	% of cohort
1981	50.6346282958984
1986	44.1224784851074
1987	39.8585205078125
1988	31.1726398468018
1993	52.5002212524414
1994	49.1244583129883
1995	53.0437698364258
1998	46.0388488769531
1999	53.9731712341309
2000	63.3115692138672
2001	53.5950088500977
2002	46.8615989685059
2003	47.364429473877
2004	63.2790412902832
2005	64.9346466064453
2006	59.1562690734863
2007	45.6092185974121
2008	41.3681602478027
2009	37.528881072998
2010	41.6307601928711
2011	39.6148414611816
2014	39.287281036377