Year	Percent
2000-01-01	54.575
2001-01-01	54.275
2002-01-01	54.600
2003-01-01	53.775
2004-01-01	54.125
2005-01-01	52.725
2006-01-01	52.525
2007-01-01	51.250
2008-01-01	50.700
2009-01-01	47.925
2010-01-01	46.100
2011-01-01	45.375
2012-01-01	46.050
2013-01-01	46.150
2014-01-01	47.775
2015-01-01	49.650
2016-01-01	51.150
2017-01-01	50.875