Year	Percent
2000-01-01	32.225
2001-01-01	32.400
2002-01-01	32.275
2003-01-01	32.175
2004-01-01	32.125
2005-01-01	31.925
2006-01-01	31.425
2007-01-01	31.600
2008-01-01	31.350
2009-01-01	31.475
2010-01-01	31.725
2011-01-01	31.700
2012-01-01	31.500
2013-01-01	31.250
2014-01-01	31.150
2015-01-01	31.050
2016-01-01	30.800
2017-01-01	30.725