Year	Percent
1999-01-01	36.925
2000-01-01	36.500
2001-01-01	35.925
2002-01-01	36.450
2003-01-01	36.250
2004-01-01	36.275
2005-01-01	36.875
2006-01-01	37.150
2007-01-01	37.425
2008-01-01	36.900
2009-01-01	37.325
2010-01-01	37.150
2011-01-01	37.225
2012-01-01	36.750
2013-01-01	36.650
2014-01-01	36.525
2015-01-01	36.125
2016-01-01	35.575
2017-01-01	35.575