Year	Percent
2001-01-01	3.68
2002-01-01	4.77
2003-01-01	4.83
2004-01-01	4.76
2005-01-01	4.84
2006-01-01	4.19
2007-01-01	3.92
2008-01-01	3.74
2009-01-01	3.90
2010-01-01	3.51
2011-01-01	3.11
2012-01-01	2.86
2013-01-01	2.65
2014-01-01	2.61
2015-01-01	2.89
2016-01-01	2.98