Year	% of cohort
1971	53.7515602111816
1972	55.7749290466309
1974	68.733642578125
1975	64.6546020507812
1976	46.8141708374023
1978	48.1744613647461
1979	61.2018508911133
1980	59.7315902709961
1981	56.8013916015625
1982	57.8307418823242
1983	57.4277992248535
1986	65.9876327514648
1987	49.0757102966309
1988	67.267936706543
1995	61.9193000793457