Year	Percent
2000-01-01	53.900
2001-01-01	54.900
2002-01-01	55.400
2003-01-01	55.700
2004-01-01	56.525
2005-01-01	58.300
2006-01-01	59.250
2007-01-01	62.900
2008-01-01	62.200
2009-01-01	59.075
2010-01-01	57.075
2011-01-01	56.300
2012-01-01	56.200
2013-01-01	57.125
2014-01-01	58.000
2015-01-01	59.350
2016-01-01	61.175
2017-01-01	62.350