Year	% of cohort
1970	59.6073188781738
1981	85.4086227416992
1982	82.9198913574219
1983	89.4133682250977
1984	69.8655471801758
1985	93.5731201171875
1986	94.5045394897461
1987	93.7247161865234
1988	92.3390808105469
1989	94.3168716430664