Year	% of cohort
1971	44.8016014099121
1972	29.9069309234619
1974	39.3753395080566
1988	32.2222900390625
1989	31.3840408325195
1990	37.5436782836914
1991	22.3087692260742
1992	28.9123992919922
1993	26.1611804962158
1994	23.7371692657471
1995	50.7689514160156
1998	36.5576286315918
1999	52.186149597168
2000	35.094181060791
2001	34.0308799743652
2002	55.367618560791
2003	59.4668617248535
2004	42.8576812744141
2005	35.2252388000488
2006	41.760440826416
2007	42.0429611206055
2008	48.4001998901367
2009	33.8041610717773
2010	38.9409408569336
2011	39.3928489685059
2012	36.7627487182617
2013	38.8204803466797
2014	41.4710807800293
2015	34.1023216247559
2018	29.9196891784668