Year	Percent
1998-01-01	16.5000
1999-01-01	14.9000
2000-01-01	13.7000
2001-01-01	13.8000
2002-01-01	13.0000
2003-01-01	11.8000
2004-01-01	12.4000
2005-01-01	11.6000
2006-01-01	11.0000
2007-01-01	10.4000
2008-01-01	12.3000
2009-01-01	13.9000
2010-01-01	13.8917
2011-01-01	13.8152
2012-01-01	16.3120
2013-01-01	17.4150
2014-01-01	16.9222
2015-01-01	16.9492
2016-01-01	17.9739