Year	Percent
1999-01-01	7.23
2000-01-01	9.23
2001-01-01	11.02
2002-01-01	8.26
2003-01-01	6.92
2004-01-01	8.45
2005-01-01	6.84
2006-01-01	7.78
2007-01-01	7.42
2008-01-01	6.86
2009-01-01	10.04
2010-01-01	8.14
2011-01-01	8.79
2012-01-01	8.58
2013-01-01	8.12
2014-01-01	8.92
2015-01-01	9.39
2016-01-01	10.21