Year	Percent
2001-01-01	37.550
2002-01-01	37.625
2003-01-01	37.775
2004-01-01	37.925
2005-01-01	37.150
2006-01-01	36.675
2007-01-01	36.325
2008-01-01	36.050
2009-01-01	36.700
2010-01-01	36.725
2011-01-01	36.300
2012-01-01	36.075
2013-01-01	35.700
2014-01-01	35.275
2015-01-01	35.175
2016-01-01	35.050
2017-01-01	34.425