Year	% of cohort
1999	98.5164489746094
2000	90.1109771728516
2001	94.0766983032227
2002	100
2003	99.2543334960938
2004	82.9797897338867
2007	93.3988876342773
2008	94.8703918457031
2009	94.0770111083984
2011	96.8562469482422
2012	99.8115005493164
2013	98.6442794799805
2015	99.2631378173828
2016	98.7167205810547
2017	98.8897323608398
2018	98.6364974975586
2019	98.0336608886719
2020	99.1758575439453
2021	99.1728134155273