Year	Percent
2005-01-01	54.650
2006-01-01	55.275
2007-01-01	55.625
2008-01-01	56.100
2009-01-01	56.475
2010-01-01	56.725
2011-01-01	57.050
2012-01-01	57.600
2013-01-01	57.950
2014-01-01	58.225
2015-01-01	58.350
2016-01-01	58.700
2017-01-01	59.025