Year	Percent
2001-01-01	50.025
2002-01-01	48.475
2003-01-01	47.250
2004-01-01	47.075
2005-01-01	48.975
2006-01-01	50.800
2007-01-01	51.775
2008-01-01	52.625
2009-01-01	51.075
2010-01-01	51.950
2011-01-01	53.150
2012-01-01	51.750
2013-01-01	53.875
2014-01-01	54.875
2015-01-01	53.850
2016-01-01	54.200
2017-01-01	54.075