Year	Percent
2000-01-01	37.900
2001-01-01	38.100
2002-01-01	38.025
2003-01-01	37.925
2004-01-01	37.925
2005-01-01	37.750
2006-01-01	37.325
2007-01-01	37.475
2008-01-01	37.225
2009-01-01	37.425
2010-01-01	37.675
2011-01-01	37.675
2012-01-01	37.525
2013-01-01	37.375
2014-01-01	37.325
2015-01-01	37.250
2016-01-01	37.100
2017-01-01	37.100