Year	Percent
2002-01-01	7.89
2003-01-01	9.02
2004-01-01	9.42
2005-01-01	9.88
2006-01-01	9.96
2007-01-01	10.52
2008-01-01	10.64
2009-01-01	12.45
2010-01-01	13.30
2011-01-01	20.20
2012-01-01	18.69
2013-01-01	18.42
2014-01-01	20.69
2015-01-01	22.13