Year	Percent
1999-01-01	35.700
2000-01-01	35.300
2001-01-01	35.750
2002-01-01	35.700
2003-01-01	34.975
2004-01-01	35.275
2005-01-01	35.050
2006-01-01	34.675
2007-01-01	33.825
2008-01-01	33.400
2009-01-01	32.450
2010-01-01	32.525
2011-01-01	32.000
2012-01-01	31.475
2013-01-01	31.000
2014-01-01	30.175
2015-01-01	29.975
2016-01-01	28.450
2017-01-01	28.100