Year	Percent
1998-01-01	9.60
1999-01-01	11.10
2000-01-01	13.46
2001-01-01	13.06
2002-01-01	6.52
2003-01-01	5.14
2004-01-01	7.63
2005-01-01	9.31
2006-01-01	16.15
2007-01-01	14.04
2008-01-01	18.25
2009-01-01	9.00
2010-01-01	4.60
2011-01-01	4.30
2012-01-01	5.35
2013-01-01	5.25
2014-01-01	4.50
2015-01-01	5.65
2016-01-01	4.85
2017-01-01	4.10