Year	Percent
2005-01-01	56.300
2006-01-01	56.625
2007-01-01	56.825
2008-01-01	57.075
2009-01-01	57.000
2010-01-01	56.850
2011-01-01	56.850
2012-01-01	57.075
2013-01-01	57.025
2014-01-01	56.900
2015-01-01	56.800
2016-01-01	57.100
2017-01-01	57.150