Year	Percent
1998-01-01	0.80000
1999-01-01	0.60000
2000-01-01	0.60000
2001-01-01	0.70000
2002-01-01	1.70000
2003-01-01	0.80000
2004-01-01	0.70000
2005-01-01	0.20000
2006-01-01	0.20000
2007-01-01	0.60000
2008-01-01	1.20000
2009-01-01	3.30000
2010-01-01	4.06864
2011-01-01	3.66034
2012-01-01	5.95052
2013-01-01	4.61814
2014-01-01	4.40079
2015-01-01	3.77854
2016-01-01	3.21013