Year	Percent
2005-01-01	56.200
2006-01-01	57.075
2007-01-01	58.000
2008-01-01	58.325
2009-01-01	57.025
2010-01-01	56.675
2011-01-01	56.825
2012-01-01	56.425
2013-01-01	56.075
2014-01-01	56.300
2015-01-01	56.825
2016-01-01	57.700
2017-01-01	58.400