Year	Percent
2000-01-01	3.84286839125610
2001-01-01	3.50553337771628
2002-01-01	2.89426859149262
2003-01-01	3.47078995354794
2004-01-01	3.53877766240028
2005-01-01	3.58870452327181
2006-01-01	3.12995134226984
2007-01-01	2.81684633368205
2008-01-01	2.77375709956795
2009-01-01	3.17510785750524
2010-01-01	3.41735539081349
2011-01-01	3.19275172673252
2012-01-01	3.05731400234497
2013-01-01	2.96071337341432
2014-01-01	3.60048247561799
2015-01-01	3.65798643655057
2016-01-01	3.71570624192089
2017-01-01	3.63580419209277