Year	% of cohort
1999	88.7810897827148
2000	94.1888580322266
2006	86.9575424194336
2010	78.0395126342773
2011	92.4111709594727
2014	93.3515930175781
2015	89.8566207885742
2016	93.0722427368164
2017	86.9042663574219
2018	92.7003173828125
2019	92.3006210327148