Year	Percent
2000-01-01	31.850
2001-01-01	32.000
2002-01-01	31.675
2003-01-01	31.725
2004-01-01	31.475
2005-01-01	31.200
2006-01-01	30.775
2007-01-01	31.075
2008-01-01	30.675
2009-01-01	30.525
2010-01-01	30.675
2011-01-01	30.375
2012-01-01	29.775
2013-01-01	29.125
2014-01-01	28.675
2015-01-01	28.300
2016-01-01	27.775
2017-01-01	27.100