Year	% of cohort
1999	87.2219772338867
2000	94.5990524291992
2001	88.1297988891602
2002	85.7525787353516
2003	90.8901672363281
2004	86.5766677856445
2005	83.8789367675781
2006	91.6622314453125
2007	86.0738372802734
2008	90.3343811035156
2010	87.5359802246094
2011	90.492919921875
2013	86.9182968139648
2015	81.5565719604492
2016	90.9486618041992
2017	82.7184829711914
2018	82.8219604492188
2019	82.6897964477539
2020	85.229850769043
2021	89.8423919677734