Year	Percent
1998-01-01	7.30000
1999-01-01	7.40000
2000-01-01	6.70000
2001-01-01	6.70000
2002-01-01	7.50000
2003-01-01	8.40000
2004-01-01	6.90000
2005-01-01	6.90000
2006-01-01	6.90000
2007-01-01	6.90000
2008-01-01	6.90000
2009-01-01	6.90000
2010-01-01	6.90000
2011-01-01	10.82980
2012-01-01	9.45068
2013-01-01	10.80400
2014-01-01	10.88590
2015-01-01	10.58860