Year	Percent
1998-01-01	17.7000
1999-01-01	17.5000
2000-01-01	16.2000
2001-01-01	15.6000
2002-01-01	16.9000
2003-01-01	17.4000
2004-01-01	18.4000
2005-01-01	17.7000
2006-01-01	17.5000
2007-01-01	15.7000
2008-01-01	14.9000
2009-01-01	15.5000
2010-01-01	16.6882
2011-01-01	17.1210
2012-01-01	17.8218
2013-01-01	17.0169
2014-01-01	16.0804
2015-01-01	15.2847
2016-01-01	14.4643