Year	Percent
1998-01-01	12.2000
1999-01-01	12.2000
2000-01-01	12.4000
2001-01-01	12.9000
2002-01-01	13.0000
2003-01-01	13.0000
2004-01-01	13.2000
2005-01-01	12.9000
2006-01-01	13.0000
2007-01-01	12.8000
2008-01-01	12.8000
2009-01-01	13.9000
2010-01-01	14.7891
2011-01-01	14.6852
2012-01-01	14.5066
2013-01-01	14.4050
2014-01-01	14.3854
2015-01-01	14.1374
2016-01-01	14.1911