Year	Percent
2000	99.06701
2001	99.11376
2002	99.15533
2003	99.15127
2004	99.14715
2005	99.14299
2006	99.13878
2007	99.13453
2008	99.13022
2009	99.12587
2010	99.12147
2011	99.11702
2012	99.11252
2013	99.10798
2014	99.10338
2015	99.14985
2016	99.19631
2017	99.24278
2018	99.28924
2019	99.33571
2020	99.38009
2021	99.38009
2022	99.38009