Year	Percent
2002-01-01	5.60
2003-01-01	6.10
2004-01-01	6.07
2005-01-01	6.16
2006-01-01	6.57
2007-01-01	6.45
2008-01-01	5.98
2009-01-01	6.45
2010-01-01	6.50
2011-01-01	6.63
2012-01-01	7.11
2013-01-01	7.70
2014-01-01	7.95
2015-01-01	8.34
2016-01-01	8.46