Year	% of cohort
1986	68.4390487670898
1987	66.8521881103516
1988	68.9721221923828
1989	55.3288116455078
1990	59.5318794250488
1991	70.2548065185547
1994	58.9797286987305
1995	69.4296035766602
1996	59.9116096496582
1997	66.2204971313477