Year	% of cohort
1983	97.1474380493164
2003	88.7245330810547
2004	96.1410675048828
2006	92.044189453125
2007	93.381950378418
2008	92.6549530029297
2009	95.9607696533203
2010	90.0008392333984
2011	95.4547119140625
2012	94.9699325561523
2013	93.0767288208008
2016	91.078239440918
2017	92.1804962158203
2018	94.1074981689453
2019	93.7482299804688