Year	Percent
2000-01-01	59.950
2001-01-01	59.750
2002-01-01	58.700
2003-01-01	58.050
2004-01-01	57.950
2005-01-01	58.100
2006-01-01	56.800
2007-01-01	56.475
2008-01-01	56.950
2009-01-01	57.800
2010-01-01	58.525
2011-01-01	58.875
2012-01-01	59.750
2013-01-01	60.150
2014-01-01	61.125
2015-01-01	61.400
2016-01-01	61.975
2017-01-01	62.600