Year	% of cohort
2006	96.9606094360352
2007	97.5285186767578
2008	96.1156311035156
2009	95.7368087768555
2010	94.8788375854492
2011	92.6149063110352
2012	93.7739410400391
2013	94.2614135742188
2014	96.1574630737305
2015	96.7387008666992
2016	96.4048614501953
2017	97.0996780395508
2018	97.1669387817383
2019	97.3124618530273
2020	98.4452514648438
2021	94.9940032958984