Year	Percent
2005-01-01	51.875
2006-01-01	52.900
2007-01-01	54.025
2008-01-01	54.775
2009-01-01	54.800
2010-01-01	55.225
2011-01-01	56.600
2012-01-01	56.850
2013-01-01	57.175
2014-01-01	57.400
2015-01-01	57.400
2016-01-01	58.500
2017-01-01	58.900