Year	Percent
1999-01-01	1.91
2000-01-01	1.96
2001-01-01	2.14
2002-01-01	2.50
2003-01-01	2.47
2004-01-01	2.43
2005-01-01	2.55
2006-01-01	2.53
2007-01-01	2.32
2008-01-01	2.22
2009-01-01	2.20
2010-01-01	2.20
2011-01-01	2.20
2012-01-01	2.20
2013-01-01	1.91
2014-01-01	1.85
2015-01-01	1.79
2016-01-01	1.78