Year	Percent
2000-01-01	46.9889971447062
2001-01-01	47.7169380891441
2002-01-01	48.4898861736529
2003-01-01	47.4480741005872
2004-01-01	48.4571292701628
2005-01-01	48.5585421805028
2006-01-01	49.0093272815973
2007-01-01	49.1169853761676
2008-01-01	48.8852057271131
2009-01-01	47.8170233458472
2010-01-01	47.9280560496200
2011-01-01	48.2639058394036
2012-01-01	48.6332874858721
2013-01-01	48.9157883184358
2014-01-01	49.7085467543833
2015-01-01	50.0566585666937
2016-01-01	50.2932734338293
2017-01-01	50.7939177041289