Year	Percent
1998-01-01	13.90000
1999-01-01	9.90000
2000-01-01	10.20000
2001-01-01	11.50000
2002-01-01	10.50000
2003-01-01	9.80000
2004-01-01	9.50000
2005-01-01	7.90000
2006-01-01	7.60000
2007-01-01	7.90000
2008-01-01	8.20000
2009-01-01	7.30000
2010-01-01	8.52962
2011-01-01	10.77590
2012-01-01	12.28340
2013-01-01	12.62000
2014-01-01	12.91230
2015-01-01	12.97970
2016-01-01	10.41810