Year	Percent
1996-12-31	6
1997-12-31	7.205
1998-12-31	5.8
1999-12-31	4.8
2000-12-31	5.25
2001-12-31	3.95
2002-12-31	3.95
2003-12-31	3.7
2004-12-31	4.725
2005-12-31	4.505
2006-12-31	5.06
2007-12-31	5.525
2008-12-31	1.675
2009-12-31	0.485
2010-12-31	0.555
2011-12-31	0.325
2012-12-31	0.365
2013-12-31	0.335
2014-12-31	0.395
2015-12-31	0.44
2016-12-31	0.245
2017-12-31	0.42