Year	Percent
1998-01-01	18.1000
1999-01-01	20.6000
2000-01-01	19.6000
2001-01-01	18.2000
2002-01-01	16.9000
2003-01-01	17.9000
2004-01-01	16.2000
2005-01-01	15.8000
2006-01-01	15.4000
2007-01-01	13.5000
2008-01-01	14.7000
2009-01-01	17.3000
2010-01-01	18.5840
2011-01-01	16.0466
2012-01-01	18.0597
2013-01-01	16.3863
2014-01-01	15.9241
2015-01-01	15.8607
2016-01-01	16.4650