Year	% of cohort
1973	37.3582992553711
1974	43.9198417663574
1975	31.1402606964111
1976	32.1962699890137
1977	30.0343608856201
1978	31.6429290771484
1979	39.8613700866699
1980	33.1887092590332
1981	39.7696800231934
1982	27.3111190795898
1983	30.7100200653076
1984	41.299560546875
1985	40.6286315917969
1986	54.0870895385742
1987	38.3609085083008
1988	52.2663993835449
1989	46.2263717651367
1990	39.4105606079102
1991	53.4436492919922
1992	34.7942581176758
1993	29.8351993560791
1995	28.3868999481201
1998	37.6518402099609
1999	36.254020690918
2000	37.15576171875
2001	32.8045616149902
2004	33.8424911499023
2005	36.1368408203125
2006	35.9313583374023
2007	59.8712387084961
2008	41.9486999511719
2009	52.8126487731934
2010	50.9017486572266
2011	49.1162185668945
2012	62.3302612304688
2013	54.072208404541