Year	Percent
2000-01-01	52.325
2001-01-01	53.700
2002-01-01	54.525
2003-01-01	54.350
2004-01-01	54.175
2005-01-01	54.550
2006-01-01	55.500
2007-01-01	57.075
2008-01-01	58.125
2009-01-01	58.350
2010-01-01	56.275
2011-01-01	55.575
2012-01-01	55.600
2013-01-01	54.925
2014-01-01	53.900
2015-01-01	54.525
2016-01-01	54.875
2017-01-01	55.700