Year	Percent
2003-01-01	56.050
2004-01-01	56.400
2005-01-01	56.750
2006-01-01	57.000
2007-01-01	57.525
2008-01-01	57.850
2009-01-01	58.375
2010-01-01	58.450
2011-01-01	58.350
2012-01-01	58.625
2013-01-01	58.875
2014-01-01	58.725
2015-01-01	58.650
2016-01-01	58.525
2017-01-01	58.225