Year	Percent
2005-01-01	67.000
2006-01-01	67.400
2007-01-01	67.600
2008-01-01	68.200
2009-01-01	68.200
2010-01-01	67.000
2011-01-01	67.450
2012-01-01	67.500
2013-01-01	67.525
2014-01-01	67.925
2015-01-01	68.175
2016-01-01	68.575
2017-01-01	68.475