Year	Percent
2000-01-01	5.55
2001-01-01	5.22
2002-01-01	5.13
2003-01-01	5.35
2004-01-01	5.47
2005-01-01	5.99
2006-01-01	6.17
2007-01-01	6.42
2008-01-01	6.07
2009-01-01	6.84
2010-01-01	6.97
2011-01-01	7.09
2012-01-01	7.82
2013-01-01	8.49
2014-01-01	8.56
2015-01-01	9.05