Year	% of cohort
1971	40.5853118896484
1972	29.0453205108643
1974	44.6216316223145
1988	37.0537796020508
1989	34.4428100585938
1990	41.3291206359863
1991	21.22998046875
1992	34.5016899108887
1993	30.2123107910156
1994	32.2913398742676
1995	33.2676811218262
1998	38.9202308654785
1999	52.6605606079102
2000	37.2193298339844
2001	35.3494110107422
2002	55.4480018615723
2003	60.2642211914062
2004	42.9119186401367
2005	36.7656211853027
2006	43.2003784179688
2007	43.2916603088379
2008	50.4006996154785
2009	35.3794593811035
2010	40.1005516052246
2011	41.9477005004883
2012	39.1940116882324
2013	41.2924690246582
2014	43.675838470459
2015	36.1002006530762
2018	33.2596282958984