Year	Percent
2001-01-01	49.925
2002-01-01	50.300
2003-01-01	51.750
2004-01-01	52.725
2005-01-01	49.200
2006-01-01	48.125
2007-01-01	47.275
2008-01-01	46.925
2009-01-01	49.025
2010-01-01	48.675
2011-01-01	47.200
2012-01-01	46.550
2013-01-01	44.850
2014-01-01	43.950
2015-01-01	43.475
2016-01-01	44.450
2017-01-01	44.625