Year	Percent
2002-01-01	6.52
2003-01-01	6.79
2004-01-01	6.91
2005-01-01	7.32
2006-01-01	6.31
2007-01-01	6.08
2008-01-01	6.95
2009-01-01	8.15
2010-01-01	7.93
2011-01-01	7.45
2012-01-01	7.39
2013-01-01	7.09
2014-01-01	6.83
2015-01-01	6.94
2016-01-01	6.53