Year	% of cohort
1984	93.1889877319336
1985	97.9113693237305
1986	96.5936737060547
1987	97.5573120117188
1988	96.8349914550781
1989	97.0751266479492
1990	96.2782897949219
1991	97.9999237060547
1992	91.8086624145508
1993	88.0816268920898
2004	96.9136428833008
2005	97.5326919555664
2006	97.0440216064453
2007	94.0021362304688
2008	90.6847229003906
2009	98.4876403808594
2010	94.6082305908203
2011	90.7751007080078
2014	0