Year	Percent
1998-01-01	5.40000
1999-01-01	5.20000
2000-01-01	6.50000
2001-01-01	6.50000
2002-01-01	3.90000
2003-01-01	3.70000
2004-01-01	3.00000
2005-01-01	2.50000
2006-01-01	2.50000
2007-01-01	2.50000
2008-01-01	4.20000
2009-01-01	5.80000
2010-01-01	8.21418
2011-01-01	11.81400
2012-01-01	15.18010
2013-01-01	13.31130
2014-01-01	11.73190
2015-01-01	9.96212
2016-01-01	5.07138