Year	Percent
1998-01-01	4.50
1999-01-01	2.94
2000-01-01	2.88
2001-01-01	3.06
2002-01-01	3.19
2003-01-01	3.30
2004-01-01	2.92
2005-01-01	2.79
2006-01-01	2.75
2007-01-01	2.87
2008-01-01	3.04
2009-01-01	3.16
2010-01-01	3.05
2011-01-01	2.86
2012-01-01	3.04
2013-01-01	3.09
2014-01-01	3.01
2015-01-01	2.93
2016-01-01	3.00