Year	Percent
2000-01-01	49.725
2001-01-01	49.625
2002-01-01	48.650
2003-01-01	47.950
2004-01-01	47.775
2005-01-01	47.700
2006-01-01	46.600
2007-01-01	46.250
2008-01-01	46.625
2009-01-01	47.250
2010-01-01	47.575
2011-01-01	47.775
2012-01-01	48.150
2013-01-01	48.150
2014-01-01	48.500
2015-01-01	48.425
2016-01-01	48.350
2017-01-01	48.425