Year	Percent
1998-01-01	18.3000
1999-01-01	15.2000
2000-01-01	11.9000
2001-01-01	10.4000
2002-01-01	9.5000
2003-01-01	8.9000
2004-01-01	8.6000
2005-01-01	9.0000
2006-01-01	10.1000
2007-01-01	12.4000
2008-01-01	13.3000
2009-01-01	13.8000
2010-01-01	13.7688
2011-01-01	13.5612
2012-01-01	14.2242
2013-01-01	13.8904
2014-01-01	14.0439
2015-01-01	12.6826
2016-01-01	14.0434