Year	Percent
1996-12-31	6.02
1997-12-31	7.225
1998-12-31	5.78
1999-12-31	5.2
2000-12-31	5.695
2001-12-31	3.88
2002-12-31	3.905
2003-12-31	3.775
2004-12-31	4.725
2005-12-31	4.495
2006-12-31	5.09
2007-12-31	5.485
2008-12-31	1.575
2009-12-31	0.485
2010-12-31	0.575
2011-12-31	0.375
2012-12-31	0.425
2013-12-31	0.41
2014-12-31	0.425
2015-12-31	0.535
2016-12-31	0.28
2017-12-31	0.455