Year	Percent
2000-01-01	52.250
2001-01-01	51.550
2002-01-01	50.850
2003-01-01	50.375
2004-01-01	49.800
2005-01-01	48.175
2006-01-01	46.950
2007-01-01	43.050
2008-01-01	43.150
2009-01-01	43.875
2010-01-01	44.750
2011-01-01	45.050
2012-01-01	45.250
2013-01-01	44.725
2014-01-01	45.075
2015-01-01	45.175
2016-01-01	44.425
2017-01-01	44.325