Year	Percent
1998-01-01	7.30000
1999-01-01	10.60000
2000-01-01	12.10000
2001-01-01	12.10000
2002-01-01	14.00000
2003-01-01	14.60000
2004-01-01	13.30000
2005-01-01	12.80000
2006-01-01	12.10000
2007-01-01	13.30000
2008-01-01	10.80000
2009-01-01	13.10000
2010-01-01	12.89560
2011-01-01	11.82980
2012-01-01	11.78210
2013-01-01	11.48520
2014-01-01	8.53662
2015-01-01	8.92084
2016-01-01	10.36030