Year	% of cohort
1999	95.1488723754883
2000	93.9852828979492
2001	92.204963684082
2002	92.1112289428711
2003	94.1906127929688
2004	96.7544326782227
2005	96.7368698120117
2006	96.0283966064453
2007	98.3101806640625
2008	95.7351379394531
2009	97.9642791748047
2010	94.6803283691406
2011	96.695671081543
2012	97.1825790405273
2013	97.9794235229492
2014	96.4972610473633
2015	98.5818481445312
2016	97.4453277587891
2017	97.6946334838867
2018	98.7069473266602
2019	96.8095016479492
2020	97.498176574707