Year	Percent
2001-01-01	29.950
2002-01-01	30.075
2003-01-01	30.250
2004-01-01	30.475
2005-01-01	29.625
2006-01-01	29.125
2007-01-01	28.800
2008-01-01	28.750
2009-01-01	29.375
2010-01-01	29.475
2011-01-01	29.050
2012-01-01	28.875
2013-01-01	28.500
2014-01-01	28.050
2015-01-01	27.975
2016-01-01	27.900
2017-01-01	27.300