Year	Percent
2003-01-01	69.700
2004-01-01	69.775
2005-01-01	69.700
2006-01-01	69.625
2007-01-01	69.700
2008-01-01	69.875
2009-01-01	70.250
2010-01-01	70.250
2011-01-01	70.100
2012-01-01	70.725
2013-01-01	71.125
2014-01-01	71.000
2015-01-01	71.250
2016-01-01	71.425
2017-01-01	71.500