Year	Percent
1999-01-01	10.400
2000-01-01	8.700
2001-01-01	7.500
2002-01-01	8.650
2003-01-01	8.825
2004-01-01	9.550
2005-01-01	9.525
2006-01-01	9.325
2007-01-01	8.475
2008-01-01	7.600
2009-01-01	8.125
2010-01-01	8.525
2011-01-01	7.175
2012-01-01	7.425
2013-01-01	8.200
2014-01-01	7.975
2015-01-01	7.775
2016-01-01	7.575
2017-01-01	7.075