Year	Percent
1998-01-01	15.3000
1999-01-01	14.0000
2000-01-01	13.5000
2001-01-01	13.5000
2002-01-01	11.9000
2003-01-01	11.5000
2004-01-01	11.8000
2005-01-01	10.5000
2006-01-01	11.0000
2007-01-01	11.2000
2008-01-01	11.7000
2009-01-01	11.7000
2010-01-01	11.3205
2011-01-01	11.8549
2012-01-01	11.3998
2013-01-01	13.6727
2014-01-01	18.0350
2015-01-01	18.7663
2016-01-01	19.1550