Year	Percent
1998-01-01	20.0000
1999-01-01	20.5000
2000-01-01	19.5000
2001-01-01	19.8000
2002-01-01	19.0000
2003-01-01	18.6000
2004-01-01	16.9000
2005-01-01	17.4000
2006-01-01	17.3000
2007-01-01	14.4000
2008-01-01	13.0000
2009-01-01	19.9000
2010-01-01	19.3606
2011-01-01	20.0526
2012-01-01	20.5594
2013-01-01	19.2633
2014-01-01	18.1122
2015-01-01	18.3002
2016-01-01	18.9062