Year	Percent
2001-01-01	70.050
2002-01-01	69.925
2003-01-01	69.750
2004-01-01	69.525
2005-01-01	70.375
2006-01-01	70.875
2007-01-01	71.200
2008-01-01	71.250
2009-01-01	70.625
2010-01-01	70.525
2011-01-01	70.950
2012-01-01	71.125
2013-01-01	71.500
2014-01-01	71.950
2015-01-01	72.025
2016-01-01	72.100
2017-01-01	72.700