Year	Percent
2005-01-01	57.700
2006-01-01	58.600
2007-01-01	60.300
2008-01-01	61.600
2009-01-01	61.000
2010-01-01	59.000
2011-01-01	60.600
2012-01-01	61.850
2013-01-01	63.250
2014-01-01	64.125
2015-01-01	66.250
2016-01-01	67.925
2017-01-01	68.025