Year	% of cohort
1971	75.5558090209961
1998	84.3328018188477
1999	96.2939071655273
2000	96.8702163696289
2001	97.8082962036133
2002	97.2489395141602
2003	96.6326370239258
2004	97.8443298339844
2005	97.9989624023438
2006	97.1363983154297
2007	97.0254592895508
2008	96.1642608642578
2009	96.5653610229492
2010	96.9836120605469
2011	97.5995178222656
2012	97.9526519775391
2013	97.282341003418
2014	96.4573364257812
2015	97.1413192749023
2016	96.6066589355469
2017	97.2928314208984
2018	97.1551208496094
2019	96.529541015625
2020	97.7014770507812
2021	95.4276962280273