Year	Percent
2003-01-01	73.300
2004-01-01	72.800
2005-01-01	73.300
2006-01-01	72.600
2007-01-01	72.350
2008-01-01	71.475
2009-01-01	73.175
2010-01-01	73.125
2011-01-01	72.050
2012-01-01	72.450
2013-01-01	72.150
2014-01-01	72.600
2015-01-01	71.300
2016-01-01	70.525
2017-01-01	69.925