Year	Percent
1998-01-01	13.3000
1999-01-01	12.5000
2000-01-01	12.1000
2001-01-01	11.8000
2002-01-01	12.2000
2003-01-01	8.9000
2004-01-01	12.9000
2005-01-01	12.5000
2006-01-01	12.3000
2007-01-01	12.8000
2008-01-01	17.1000
2009-01-01	17.5000
2010-01-01	16.0179
2011-01-01	17.3477
2012-01-01	18.2366
2013-01-01	16.6857
2014-01-01	16.0902
2015-01-01	15.9683
2016-01-01	17.1819