Year	Percent
1998-01-01	11.2000
1999-01-01	14.7000
2000-01-01	13.1000
2001-01-01	13.5000
2002-01-01	14.4000
2003-01-01	12.2000
2004-01-01	12.0000
2005-01-01	12.0000
2006-01-01	12.0000
2007-01-01	19.2000
2008-01-01	19.8000
2009-01-01	19.6000
2010-01-01	18.3284
2011-01-01	18.0945
2012-01-01	18.2861
2013-01-01	17.7429
2014-01-01	19.0689
2015-01-01	20.2848
2016-01-01	16.9075