Year	Percent
2000-01-01	61.675
2001-01-01	60.425
2002-01-01	60.750
2003-01-01	60.075
2004-01-01	60.525
2005-01-01	59.200
2006-01-01	59.725
2007-01-01	58.600
2008-01-01	58.175
2009-01-01	57.125
2010-01-01	55.900
2011-01-01	55.675
2012-01-01	56.275
2013-01-01	56.375
2014-01-01	56.075
2015-01-01	57.000
2016-01-01	57.525
2017-01-01	56.875