Year	% of cohort
1999	90.4278869628906
2001	95.1493682861328
2002	94.9858703613281
2003	97.7058563232422
2004	99.6737976074219
2005	93.6200485229492
2008	89.6874618530273
2010	91.0353927612305
2020	98.103157043457
2021	97.3825531005859