Year	Percent
2000-01-01	39.325
2001-01-01	39.475
2002-01-01	39.075
2003-01-01	39.050
2004-01-01	38.750
2005-01-01	38.375
2006-01-01	37.800
2007-01-01	38.100
2008-01-01	37.725
2009-01-01	37.525
2010-01-01	37.625
2011-01-01	37.475
2012-01-01	37.250
2013-01-01	36.800
2014-01-01	36.500
2015-01-01	36.300
2016-01-01	35.950
2017-01-01	35.575