Year	Percent
2005-01-01	53.850
2006-01-01	54.625
2007-01-01	55.200
2008-01-01	55.850
2009-01-01	56.250
2010-01-01	56.500
2011-01-01	56.950
2012-01-01	57.575
2013-01-01	57.875
2014-01-01	58.050
2015-01-01	58.175
2016-01-01	58.650
2017-01-01	58.850