Year	Percent
2000-01-01	47.750
2001-01-01	48.450
2002-01-01	49.150
2003-01-01	49.625
2004-01-01	50.200
2005-01-01	51.825
2006-01-01	53.050
2007-01-01	56.950
2008-01-01	56.850
2009-01-01	56.125
2010-01-01	55.250
2011-01-01	54.950
2012-01-01	54.750
2013-01-01	55.275
2014-01-01	54.925
2015-01-01	54.825
2016-01-01	55.575
2017-01-01	55.675