Year	Percent
1999-01-01	29.000
2000-01-01	29.050
2001-01-01	28.375
2002-01-01	28.950
2003-01-01	28.950
2004-01-01	28.800
2005-01-01	28.750
2006-01-01	28.875
2007-01-01	29.350
2008-01-01	28.800
2009-01-01	28.925
2010-01-01	29.225
2011-01-01	28.925
2012-01-01	28.550
2013-01-01	28.775
2014-01-01	28.625
2015-01-01	28.950
2016-01-01	28.625
2017-01-01	28.925