Year	% of cohort
2006	95.1269683837891
2007	94.2958984375
2008	96.1896591186523
2009	95.7175827026367
2010	94.9696426391602
2011	92.4820098876953
2012	93.9152908325195
2013	95.0452423095703
2014	96.0257568359375
2015	98.0425567626953
2016	97.8412322998047
2017	97.9617004394531
2018	97.2792587280273
2019	97.4991836547852
2020	99.2019271850586
2021	96.6746520996094