Year	% of cohort
1970	32.7426490783691
1971	27.7019500732422
1972	32.6261711120605
1973	28.7816505432129
1976	33.6699104309082
1977	30.9305591583252
1978	28.2066097259521
1979	43.7383308410645
1982	43.7946014404297
1983	33.5519905090332
1984	49.368480682373
1985	29.0338897705078
1986	41.2487411499023
1987	38.1404685974121
1988	33.2143096923828
1989	44.1404800415039
1990	45.5734901428223
1991	44.1778717041016
1992	54.3395614624023
1993	54.2013816833496
1994	47.0009994506836
1999	48.4468688964844
2000	54.2357788085938
2001	64.838020324707
2002	55.1324691772461
2003	58.796630859375
2004	53.5514297485352
2005	53.6641883850098
2006	47.0242614746094
2007	51.3750915527344