Year	Percent
2000-01-01	48.925
2001-01-01	47.700
2002-01-01	46.250
2003-01-01	46.000
2004-01-01	46.225
2005-01-01	46.800
2006-01-01	48.200
2007-01-01	50.575
2008-01-01	52.375
2009-01-01	52.750
2010-01-01	52.600
2011-01-01	52.700
2012-01-01	53.125
2013-01-01	53.375
2014-01-01	55.175
2015-01-01	56.600
2016-01-01	58.075
2017-01-01	59.500