Year	% of cohort
1972	84.4816513061523
1977	77.0381088256836
1978	80.9952011108398
1979	74.1416015625
1980	90.6754531860352
1981	83.1106719970703
1982	76.2751998901367
1983	68.9781188964844
1999	86.0571212768555
2000	65.1068572998047
2008	83.4667510986328
2011	92.1871871948242