Year	% of cohort
2008	99.5653381347656
2009	99.3395690917969
2010	98.7015686035156
2011	99.2839431762695
2012	99.729606628418
2013	99.2208023071289
2014	98.7339096069336
2015	99.3395080566406
2016	99.424919128418
2017	99.3955612182617
2018	99.8034515380859
2019	99.732551574707
2020	99.4888534545898
2021	99.7950134277344