Year	Percent
2000-01-01	56.925
2001-01-01	57.575
2002-01-01	57.375
2003-01-01	57.350
2004-01-01	58.025
2005-01-01	59.275
2006-01-01	60.375
2007-01-01	63.325
2008-01-01	61.475
2009-01-01	56.025
2010-01-01	53.500
2011-01-01	52.450
2012-01-01	52.125
2013-01-01	53.450
2014-01-01	54.425
2015-01-01	55.700
2016-01-01	57.000
2017-01-01	57.825