Year	Percent
1998-01-01	13.5000
1999-01-01	13.0000
2000-01-01	13.3000
2001-01-01	13.7000
2002-01-01	13.3000
2003-01-01	14.5000
2004-01-01	12.4000
2005-01-01	11.8000
2006-01-01	13.2000
2007-01-01	12.7000
2008-01-01	12.9000
2009-01-01	15.0000
2010-01-01	15.4414
2011-01-01	15.8269
2012-01-01	16.9607
2013-01-01	17.9693
2014-01-01	16.2529
2015-01-01	16.5425
2016-01-01	17.9764