Year	Percent
2005-01-01	72.200
2006-01-01	72.800
2007-01-01	73.600
2008-01-01	73.300
2009-01-01	72.400
2010-01-01	71.025
2011-01-01	71.650
2012-01-01	71.325
2013-01-01	70.775
2014-01-01	70.675
2015-01-01	70.725
2016-01-01	70.875
2017-01-01	71.075