Year	Percent
1998-01-01	4.50
1999-01-01	4.60
2000-01-01	4.70
2001-01-01	4.60
2002-01-01	5.00
2003-01-01	5.20
2004-01-01	4.90
2005-01-01	4.10
2006-01-01	3.40
2007-01-01	2.70
2008-01-01	2.90
2009-01-01	3.30
2010-01-01	3.20
2011-01-01	3.03
2012-01-01	2.86
2013-01-01	2.70
2014-01-01	2.34
2015-01-01	1.98