Year	% of cohort
1970	54.7542610168457
1981	84.8932723999023
1982	80.6901931762695
1983	87.9795227050781
1984	68.6841506958008
1985	90.9268112182617
1987	93.2696990966797
1988	91.2218475341797
1989	94.4609527587891