Year	Percent
2001-01-01	1.92
2002-01-01	2.22
2003-01-01	2.42
2004-01-01	2.62
2005-01-01	2.79
2006-01-01	3.22
2007-01-01	3.41
2008-01-01	3.01
2009-01-01	3.59
2010-01-01	2.88
2011-01-01	2.56
2012-01-01	2.59
2013-01-01	2.46
2014-01-01	2.80
2015-01-01	3.06
2016-01-01	4.56