Year	Percent
1998-01-01	12.5000
1999-01-01	12.2000
2000-01-01	11.4000
2001-01-01	8.8000
2002-01-01	8.8000
2003-01-01	8.5000
2004-01-01	10.5000
2005-01-01	11.3000
2006-01-01	12.7000
2007-01-01	12.3000
2008-01-01	12.2000
2009-01-01	14.1000
2010-01-01	13.9711
2011-01-01	14.5836
2012-01-01	15.3505
2013-01-01	14.8551
2014-01-01	17.0786
2015-01-01	17.3418
2016-01-01	16.1712