Year	Percent
2000-01-01	14.625
2001-01-01	17.200
2002-01-01	19.475
2003-01-01	19.275
2004-01-01	18.500
2005-01-01	16.850
2006-01-01	13.150
2007-01-01	9.100
2008-01-01	6.500
2009-01-01	7.850
2010-01-01	9.475
2011-01-01	9.150
2012-01-01	9.550
2013-01-01	9.800
2014-01-01	8.625
2015-01-01	7.450
2016-01-01	6.200
2017-01-01	4.975