Year	% of cohort
1970	32.3521385192871
1971	24.4200706481934
1972	30.2133407592773
1976	31.8138999938965
1977	29.6099491119385
1978	23.3390808105469
1979	42.3770904541016
1982	39.5508689880371
1983	24.6258201599121
1984	44.8934211730957
1985	22.3013095855713
1986	40.1521797180176
1987	41.625358581543
1992	54.251651763916
1993	54.973331451416
1994	44.9322700500488
1999	50.3674011230469
2000	56.182918548584
2001	66.4778137207031
2002	55.1228294372559
2003	58.4970092773438
2004	53.6875190734863
2005	54.621711730957
2006	48.1539688110352
2007	52.4883613586426