Year	Percent
2000-01-01	1.72
2001-01-01	1.69
2002-01-01	1.69
2003-01-01	1.69
2004-01-01	2.04
2005-01-01	2.08
2006-01-01	2.00
2007-01-01	1.84
2008-01-01	1.65
2009-01-01	2.42
2010-01-01	2.78
2011-01-01	3.12
2012-01-01	3.23
2013-01-01	3.54
2014-01-01	3.84
2015-01-01	3.84