Year	Percent
2003-01-01	75.600
2004-01-01	75.450
2005-01-01	75.175
2006-01-01	74.875
2007-01-01	74.675
2008-01-01	74.725
2009-01-01	74.950
2010-01-01	74.825
2011-01-01	74.625
2012-01-01	75.275
2013-01-01	75.475
2014-01-01	75.100
2015-01-01	75.300
2016-01-01	75.400
2017-01-01	75.625