Year	Percent
2000	99.86668
2001	99.86884
2002	99.86934
2003	99.86986
2004	99.87036
2005	99.86396
2006	99.84301
2007	99.76076
2008	99.67827
2009	99.59556
2010	99.51262
2011	99.42938
2012	99.34555
2013	99.26168
2014	99.17775
2015	99.09378
2016	99.00975
2017	98.92568
2018	98.84154
2019	98.75733
2020	98.67301
2021	98.58857
2022	98.58836