Year	Percent
2001-01-01	74.050
2002-01-01	73.625
2003-01-01	72.875
2004-01-01	72.050
2005-01-01	72.300
2006-01-01	73.125
2007-01-01	74.175
2008-01-01	74.325
2009-01-01	72.200
2010-01-01	72.150
2011-01-01	73.575
2012-01-01	73.775
2013-01-01	74.400
2014-01-01	74.850
2015-01-01	75.525
2016-01-01	76.200
2017-01-01	76.850