Year	Percent
2000	99.29688
2001	99.29688
2002	99.28879
2003	99.28069
2004	99.2726
2005	99.26451
2006	99.25641
2007	99.24832
2008	99.24022
2009	99.23213
2010	99.22404
2011	99.21594
2012	99.20785
2013	99.19975
2014	99.19166
2015	99.18357
2016	99.17547
2017	99.16738
2018	99.15928
2019	99.15119
2020	99.1431
2021	99.135
2022	99.135