Year	% of cohort
1984	93.2579803466797
1985	97.5180969238281
1986	95.9664535522461
1987	97.0651016235352
1988	96.3904190063477
1989	96.5584335327148
1990	95.5843200683594
1991	97.5205078125
1992	92.1886596679688
1993	89.0133438110352
1994	93.0803833007812
2003	94.8894271850586
2004	96.612922668457
2005	97.842170715332
2006	97.5021133422852
2007	94.2315216064453
2008	91.8130722045898
2009	99.2185668945312
2010	95.0054092407227
2011	90.0246505737305
2014	0