Year	Percent
2000-01-01	14.450
2001-01-01	16.925
2002-01-01	19.175
2003-01-01	18.975
2004-01-01	18.225
2005-01-01	16.650
2006-01-01	12.975
2007-01-01	9.025
2008-01-01	6.475
2009-01-01	7.775
2010-01-01	9.375
2011-01-01	9.050
2012-01-01	9.450
2013-01-01	9.700
2014-01-01	8.525
2015-01-01	7.350
2016-01-01	6.100
2017-01-01	4.900