Year	Percent
2005-01-01	65.700
2006-01-01	68.600
2007-01-01	67.400
2008-01-01	67.100
2009-01-01	67.300
2010-01-01	68.100
2011-01-01	68.550
2012-01-01	67.575
2013-01-01	68.025
2014-01-01	67.900
2015-01-01	67.500
2016-01-01	68.325
2017-01-01	68.675