Year	Percent
1998-01-01	183.2
1999-01-01	178.0
2000-01-01	146.4
2001-01-01	128.8
2002-01-01	123.7
2003-01-01	140.4
2004-01-01	168.0
2005-01-01	154.8
2006-01-01	134.8
2007-01-01	91.7
2008-01-01	74.4
2009-01-01	57.7
2010-01-01	0.0
2011-01-01	0.0
2012-01-01	0.0
2013-01-01	0.0
2014-01-01	0.0
2015-01-01	0.0
2016-01-01	0.0