Year	Percent
2003-01-01	55.600
2004-01-01	55.500
2005-01-01	56.500
2006-01-01	56.300
2007-01-01	57.400
2008-01-01	56.600
2009-01-01	58.175
2010-01-01	58.300
2011-01-01	57.675
2012-01-01	59.000
2013-01-01	59.075
2014-01-01	59.825
2015-01-01	60.450
2016-01-01	59.725
2017-01-01	59.925