Year	Percent
2003-01-01	2.91
2004-01-01	2.91
2005-01-01	2.78
2006-01-01	2.55
2007-01-01	2.37
2008-01-01	2.16
2009-01-01	2.36
2010-01-01	2.18
2011-01-01	2.08
2012-01-01	2.28
2013-01-01	2.42
2014-01-01	2.47
2015-01-01	4.64
2016-01-01	4.72