Year	Percent
2000-01-01	56.650
2001-01-01	56.625
2002-01-01	56.200
2003-01-01	55.450
2004-01-01	55.600
2005-01-01	54.300
2006-01-01	53.650
2007-01-01	52.625
2008-01-01	52.050
2009-01-01	47.875
2010-01-01	46.825
2011-01-01	45.800
2012-01-01	46.200
2013-01-01	46.250
2014-01-01	48.000
2015-01-01	50.000
2016-01-01	50.850
2017-01-01	50.650