Year	% of cohort
1973	32.628490447998
1974	35.3601684570312
1975	25.6040306091309
1976	27.1260509490967
1977	25.2646903991699
1978	25.416690826416
1979	33.1296997070312
1980	28.7780494689941
1981	29.9643096923828
1982	24.1201000213623
1983	27.4749202728271
1984	36.0898017883301
1985	38.8254890441895
1986	51.0889205932617
1987	35.7366600036621
1988	45.8416481018066
1989	42.2153701782227
1990	36.966609954834
1991	47.4246406555176
1992	38.5723991394043
1993	27.7255306243896
1995	26.5439205169678
1999	33.8354415893555
2001	30.9746208190918
2004	32.3340606689453
2005	35.9680595397949
2006	34.8993911743164
2007	57.3492889404297
2008	41.7354888916016
2009	53.5944900512695
2010	51.5504493713379
2011	47.71630859375
2012	59.3935508728027
2013	54.6252288818359