Year	Percent
1999-01-01	10.450
2000-01-01	8.700
2001-01-01	7.525
2002-01-01	8.650
2003-01-01	8.900
2004-01-01	9.575
2005-01-01	9.550
2006-01-01	9.350
2007-01-01	8.500
2008-01-01	7.625
2009-01-01	8.125
2010-01-01	8.550
2011-01-01	7.200
2012-01-01	7.425
2013-01-01	8.200
2014-01-01	7.975
2015-01-01	7.800
2016-01-01	7.600
2017-01-01	7.100