Year	% of cohort
2006	97.7088775634766
2007	98.9334335327148
2008	97.2751007080078
2009	98.7459106445312
2010	98.4470367431641
2011	98.40576171875
2012	99.9458389282227
2013	98.9143218994141
2014	96.6574096679688
2015	98.6389770507812
2016	98.3732070922852
2017	99.2054977416992
2018	98.2115478515625
2019	97.8489837646484
2020	98.7219009399414
2021	99.1099395751953