Year	Percent
2003-01-01	51.725
2004-01-01	51.525
2005-01-01	51.450
2006-01-01	51.400
2007-01-01	51.950
2008-01-01	52.375
2009-01-01	51.650
2010-01-01	51.500
2011-01-01	51.300
2012-01-01	51.175
2013-01-01	50.825
2014-01-01	50.325
2015-01-01	50.275
2016-01-01	50.300
2017-01-01	50.525