Year	Percent
1999-01-01	9.475
2000-01-01	6.725
2001-01-01	8.450
2002-01-01	7.400
2003-01-01	9.175
2004-01-01	8.200
2005-01-01	8.600
2006-01-01	7.725
2007-01-01	7.500
2008-01-01	8.025
2009-01-01	11.850
2010-01-01	13.975
2011-01-01	14.225
2012-01-01	14.150
2013-01-01	13.025
2014-01-01	12.625
2015-01-01	10.850
2016-01-01	11.975
2017-01-01	11.050