Year	Percent
2000-01-01	35.025
2001-01-01	33.625
2002-01-01	33.325
2003-01-01	33.650
2004-01-01	33.125
2005-01-01	32.275
2006-01-01	31.425
2007-01-01	30.775
2008-01-01	31.525
2009-01-01	34.400
2010-01-01	35.775
2011-01-01	36.050
2012-01-01	36.500
2013-01-01	33.275
2014-01-01	32.025
2015-01-01	29.350
2016-01-01	29.575
2017-01-01	29.125