Year	Percent
1999-01-01	7.450
2000-01-01	6.750
2001-01-01	6.200
2002-01-01	6.350
2003-01-01	6.700
2004-01-01	6.300
2005-01-01	6.525
2006-01-01	6.000
2007-01-01	4.850
2008-01-01	4.400
2009-01-01	5.875
2010-01-01	7.275
2011-01-01	8.200
2012-01-01	8.875
2013-01-01	10.150
2014-01-01	9.750
2015-01-01	9.025
2016-01-01	8.050
2017-01-01	6.575