Year	% of cohort
1983	94.4393997192383
1989	92.3948516845703
1990	93.9781723022461
1992	91.6356811523438
2001	93.7528991699219
2003	89.4190979003906
2004	95.8298797607422
2006	93.3235702514648
2007	95.6748199462891
2008	94.226676940918
2009	94.6661911010742
2010	93.7237777709961
2011	92.4901580810547
2012	95.01318359375
2013	92.1433410644531
2016	94.1112594604492
2017	94.8701934814453
2018	93.411247253418
2019	94.894157409668