Year	Percent
1998-01-01	7.70000
1999-01-01	8.10000
2000-01-01	9.00000
2001-01-01	9.20000
2002-01-01	10.10000
2003-01-01	10.60000
2004-01-01	13.60000
2005-01-01	13.30000
2006-01-01	13.00000
2007-01-01	10.40000
2008-01-01	11.20000
2009-01-01	12.90000
2010-01-01	12.30000
2011-01-01	8.16000
2012-01-01	8.80000
2013-01-01	8.69000
2014-01-01	9.02000
2015-01-01	9.47000
2016-01-01	9.78444