Year	% of cohort
1978	70.8042907714844
1980	49.6085510253906
1983	48.5033302307129
1984	47.0680084228516
1986	54.6847686767578
1987	51.6827697753906
1999	77.6614227294922
2001	88.0902404785156
2002	78.0374298095703
2003	88.853630065918
2004	89.7710418701172
2005	82.6005172729492
2007	87.1453323364258
2008	88.2762298583984
2009	85.009162902832
2010	88.5525283813477
2011	73.4748916625977