Year	% of cohort
2009	87.6135177612305
2010	89.9144821166992
2011	92.5257797241211
2012	97.6787261962891
2013	95.6933364868164
2014	97.2656707763672
2015	95.8183670043945
2016	95.4469528198242
2017	96.3736724853516
2018	98.3389892578125
2019	96.3690414428711
2021	98.1329727172852