Year	Percent
1999-01-01	34.025
2000-01-01	34.475
2001-01-01	34.050
2002-01-01	34.500
2003-01-01	34.475
2004-01-01	33.950
2005-01-01	34.350
2006-01-01	34.075
2007-01-01	34.300
2008-01-01	34.000
2009-01-01	34.650
2010-01-01	35.625
2011-01-01	36.075
2012-01-01	36.875
2013-01-01	37.650
2014-01-01	37.825
2015-01-01	37.775
2016-01-01	36.425
2017-01-01	37.750