Year	Percent
1999-01-01	15.53290
2000-01-01	14.14320
2001-01-01	13.83920
2002-01-01	15.24450
2003-01-01	15.89320
2004-01-01	16.58300
2005-01-01	15.80390
2006-01-01	16.26580
2007-01-01	13.12990
2008-01-01	10.46580
2009-01-01	11.39560
2010-01-01	14.48490
2011-01-01	11.34290
2012-01-01	10.31570
2013-01-01	9.00383
2014-01-01	9.97293
2015-01-01	9.56545
2016-01-01	8.88677