Year	Percent
2000	98.46739
2001	98.46868
2002	98.27854
2003	98.08908
2004	97.90027
2005	97.71211
2006	97.52462
2007	97.33779
2008	97.15162
2009	96.96611
2010	96.78127
2011	96.59705
2012	96.41401
2013	96.23222
2014	96.05182
2015	96.07763
2016	96.10401
2017	96.13095
2018	96.14063
2019	96.15083
2020	96.16159
2021	96.17282