Year	Percent
1998-01-01	14.4000
1999-01-01	17.5000
2000-01-01	16.7000
2001-01-01	15.1000
2002-01-01	15.8000
2003-01-01	16.5000
2004-01-01	19.1000
2005-01-01	18.4000
2006-01-01	18.8000
2007-01-01	16.1000
2008-01-01	15.5000
2009-01-01	16.3000
2010-01-01	17.6821
2011-01-01	17.6872
2012-01-01	16.8209
2013-01-01	16.5683
2014-01-01	16.6281
2015-01-01	16.1904
2016-01-01	16.4509