Year	Percent
1998-01-01	11.3000
1999-01-01	11.9000
2000-01-01	12.0000
2001-01-01	12.9000
2002-01-01	13.2000
2003-01-01	12.8000
2004-01-01	13.0000
2005-01-01	11.5000
2006-01-01	11.9000
2007-01-01	11.2000
2008-01-01	16.4000
2009-01-01	17.3000
2010-01-01	19.3047
2011-01-01	18.5366
2012-01-01	18.1920
2013-01-01	18.7426
2014-01-01	17.5773
2015-01-01	18.6887
2016-01-01	18.4989