Year	% of cohort
1980	92.3999633789062
1981	94.8775024414062
1982	92.8553924560547
1983	93.1635665893555
1984	95.7236328125
1985	95.066650390625
1986	94.0696334838867
1989	97.2135314941406
2005	99.604133605957
2008	99.3885803222656
2009	95.6119918823242
2010	98.9649200439453
2011	98.7127914428711
2012	97.6588668823242
2013	97.5847702026367
2014	98.3056030273438
2015	99.2932968139648
2016	99.8779296875
2017	99.7013168334961
2018	99.7252731323242
2019	99.9026794433594
2020	99.7832870483398