Year	Percent
2005-01-01	56.575
2006-01-01	57.425
2007-01-01	58.250
2008-01-01	58.700
2009-01-01	57.525
2010-01-01	57.225
2011-01-01	57.250
2012-01-01	57.100
2013-01-01	56.950
2014-01-01	57.475
2015-01-01	58.075
2016-01-01	58.900
2017-01-01	59.725