Year	% of cohort
1971	19.291259765625
1973	41.8983612060547
1975	57.1325988769531
1980	28.7770900726318
1981	42.4221382141113
1982	27.7130603790283
1986	12.6359395980835
1987	49.4127197265625
1988	42.4794883728027
1990	25.2109909057617
1991	14.2277402877808
2008	40.6962585449219
2009	38.8664512634277
2010	43.9173393249512
2011	45.3539199829102