Year	% of cohort
1999	93.5681304931641
2000	89.7057723999023
2006	94.8465805053711
2010	81.0613632202148
2011	91.0943984985352
2014	91.2496337890625
2015	98.7603302001953
2016	84.5078582763672
2017	88.0769271850586
2018	95.9553604125977
2019	88.1764526367188