Year	Percent
2005-01-01	56.300
2006-01-01	56.900
2007-01-01	57.200
2008-01-01	58.900
2009-01-01	58.800
2010-01-01	56.875
2011-01-01	57.650
2012-01-01	57.975
2013-01-01	58.125
2014-01-01	58.825
2015-01-01	59.200
2016-01-01	59.700
2017-01-01	59.425