Year	Percent
1996-12-31	5.95
1997-12-31	7.205
1998-12-31	5.6
1999-12-31	3.75
2000-12-31	5.175
2001-12-31	4.2
2002-12-31	4.25
2003-12-31	3.65
2004-12-31	4.725
2005-12-31	4.575
2006-12-31	4.985
2007-12-31	5.875
2008-12-31	1.7
2009-12-31	0.485
2010-12-31	0.535
2011-12-31	0.2
2012-12-31	0.305
2013-12-31	0.2
2014-12-31	0.375
2015-12-31	0.27
2016-12-31	0.2
2017-12-31	0.43