Year	Percent
2000	99.40387
2001	99.39908
2002	99.39428
2003	99.38949
2004	99.38469
2005	99.3799
2006	99.3751
2007	99.3703
2008	99.36549
2009	99.36069
2010	99.35588
2011	99.35108
2012	99.34627
2013	99.34146
2014	99.33664
2015	99.33183
2016	99.32701
2017	99.32219
2018	99.31012
2019	99.29804
2020	99.28596
2021	99.28596
2022	99.28596