Year	Percent
1998-01-01	14.40000
1999-01-01	14.70000
2000-01-01	12.80000
2001-01-01	11.40000
2002-01-01	10.40000
2003-01-01	8.80000
2004-01-01	7.20000
2005-01-01	5.20000
2006-01-01	3.50000
2007-01-01	2.70000
2008-01-01	2.40000
2009-01-01	2.20000
2010-01-01	2.38613
2011-01-01	2.67020
2012-01-01	3.37395
2013-01-01	4.02773
2014-01-01	4.34585
2015-01-01	5.88352
2016-01-01	9.18552