Year	Percent
2003-01-01	42.775
2004-01-01	43.725
2005-01-01	43.575
2006-01-01	42.750
2007-01-01	42.475
2008-01-01	42.400
2009-01-01	44.025
2010-01-01	45.000
2011-01-01	46.750
2012-01-01	50.800
2013-01-01	52.350
2014-01-01	53.100
2015-01-01	55.125
2016-01-01	56.125
2017-01-01	56.900