Year	% of cohort
1981	47.8595504760742
1986	53.6034202575684
1987	46.4875106811523
1988	26.1195392608643
1993	58.8509407043457
1994	51.4209403991699
1995	55.9330596923828
1998	43.3014488220215
1999	49.3667488098145
2000	60.0377998352051
2001	57.2178916931152
2002	54.0229415893555
2003	46.6200408935547
2004	61.7249183654785
2005	57.6571083068848
2006	56.744010925293
2007	42.0609397888184
2008	35.1247406005859
2009	35.9435691833496
2010	39.8331909179688
2011	34.006420135498
2014	37.3366317749023