Year	Percent
2000-01-01	16.300
2001-01-01	15.725
2002-01-01	15.225
2003-01-01	14.650
2004-01-01	14.050
2005-01-01	13.550
2006-01-01	12.875
2007-01-01	12.350
2008-01-01	11.450
2009-01-01	11.225
2010-01-01	12.125
2011-01-01	12.600
2012-01-01	12.325
2013-01-01	12.575
2014-01-01	12.925
2015-01-01	12.900
2016-01-01	13.075
2017-01-01	13.300