Year	Percent
1998-01-01	1.2
1999-01-01	1.0
2000-01-01	0.6
2001-01-01	0.6
2002-01-01	0.5
2003-01-01	0.5
2004-01-01	0.4
2005-01-01	0.3
2006-01-01	0.2
2007-01-01	0.3
2008-01-01	0.4
2009-01-01	0.6
2010-01-01	0.6
2011-01-01	0.5
2012-01-01	0.5