Year	Percent
2000	100
2001	100
2002	100
2003	100
2004	100
2005	100
2006	99.98168
2007	99.88624
2008	99.7908
2009	99.69536
2010	99.59992
2011	99.50448
2012	99.40904
2013	99.31359
2014	99.21815
2015	99.12271
2016	99.02727
2017	98.93183
2018	98.83639
2019	98.74095
2020	98.64551
2021	98.55007
2022	98.55007