Year	Percent
2005-01-01	66.300
2006-01-01	66.900
2007-01-01	66.900
2008-01-01	68.500
2009-01-01	68.900
2010-01-01	67.150
2011-01-01	67.900
2012-01-01	68.175
2013-01-01	68.550
2014-01-01	69.400
2015-01-01	69.775
2016-01-01	70.575
2017-01-01	70.275