Year	% of cohort
1993	100
1995	98.1356735229492
1998	96.9159088134766
1999	95.9424209594727
2000	99.0956268310547
2001	95.3099899291992
2002	97.7675933837891
2003	95.7805786132812
2004	97.6339111328125
2005	100
2006	97.5796966552734
2007	100
2008	99.9936218261719
2009	95.3796691894531
2010	98.5988998413086
2011	97.6041870117188
2012	99.8637619018555
2013	95.0528182983398
2014	99.8544387817383
2015	98.8605804443359
2016	91.3973770141602
2018	94.8790893554688
2019	97.3623123168945
2021	100