Year	Percent
2002-01-01	3.20
2003-01-01	3.01
2004-01-01	2.12
2005-01-01	2.65
2006-01-01	2.73
2007-01-01	3.00
2008-01-01	3.09
2009-01-01	3.44
2010-01-01	3.82
2011-01-01	3.69
2012-01-01	3.92
2013-01-01	3.81
2014-01-01	4.30
2015-01-01	4.74
2016-01-01	5.13