Year	Percent
2000-01-01	56.575
2001-01-01	56.450
2002-01-01	55.450
2003-01-01	54.725
2004-01-01	54.700
2005-01-01	54.925
2006-01-01	53.975
2007-01-01	53.725
2008-01-01	54.225
2009-01-01	54.925
2010-01-01	55.325
2011-01-01	55.525
2012-01-01	55.850
2013-01-01	55.925
2014-01-01	56.250
2015-01-01	56.175
2016-01-01	56.225
2017-01-01	56.450