Year	Percent
1999-01-01	9.825
2000-01-01	9.450
2001-01-01	6.425
2002-01-01	7.300
2003-01-01	7.075
2004-01-01	7.225
2005-01-01	6.325
2006-01-01	5.775
2007-01-01	5.950
2008-01-01	7.325
2009-01-01	12.075
2010-01-01	14.225
2011-01-01	15.075
2012-01-01	18.025
2013-01-01	20.025
2014-01-01	19.975
2015-01-01	18.625
2016-01-01	17.025
2017-01-01	15.350