Year	Percent
2000-01-01	31.925
2001-01-01	31.225
2002-01-01	30.475
2003-01-01	30.600
2004-01-01	30.425
2005-01-01	30.250
2006-01-01	29.775
2007-01-01	28.875
2008-01-01	28.200
2009-01-01	27.900
2010-01-01	29.550
2011-01-01	30.000
2012-01-01	29.475
2013-01-01	29.475
2014-01-01	29.950
2015-01-01	29.775
2016-01-01	29.975
2017-01-01	29.950