Year	Percent
2001-01-01	4.19
2002-01-01	3.87
2003-01-01	3.76
2004-01-01	3.50
2005-01-01	3.52
2006-01-01	3.64
2007-01-01	3.59
2008-01-01	3.02
2009-01-01	3.40
2010-01-01	3.31
2011-01-01	3.32
2012-01-01	3.44
2013-01-01	3.33
2014-01-01	3.51
2015-01-01	3.56
2016-01-01	3.53