Year	Percent
1998-01-01	9.2000
1999-01-01	9.4000
2000-01-01	9.2000
2001-01-01	9.4000
2002-01-01	9.9000
2003-01-01	10.3000
2004-01-01	10.8000
2005-01-01	10.7000
2006-01-01	10.8000
2007-01-01	11.0000
2008-01-01	11.3000
2009-01-01	13.7000
2010-01-01	14.0707
2011-01-01	14.0234
2012-01-01	14.9271
2013-01-01	14.8224
2014-01-01	14.3354
2015-01-01	14.0212
2016-01-01	14.6925