Year	Percent
2005-01-01	68.175
2006-01-01	69.500
2007-01-01	70.600
2008-01-01	71.425
2009-01-01	70.750
2010-01-01	70.625
2011-01-01	70.700
2012-01-01	70.400
2013-01-01	70.050
2014-01-01	70.275
2015-01-01	70.800
2016-01-01	71.550
2017-01-01	72.225