Year	Percent
1999-01-01	34.600
2000-01-01	34.425
2001-01-01	34.850
2002-01-01	34.850
2003-01-01	35.100
2004-01-01	34.600
2005-01-01	34.000
2006-01-01	34.300
2007-01-01	33.875
2008-01-01	34.050
2009-01-01	34.450
2010-01-01	33.975
2011-01-01	35.075
2012-01-01	35.025
2013-01-01	35.025
2014-01-01	35.350
2015-01-01	35.725
2016-01-01	35.875
2017-01-01	35.650