Year	Percent
1996-12-31	6.3355
1997-12-31	6.76
1998-12-31	6.9724
1999-12-31	5.1789
2000-12-31	6.0014
2001-12-31	4.7896
2002-12-31	3.9707
2003-12-31	3.5764
2004-12-31	4.5733
2005-12-31	4.5887
2006-12-31	4.7455
2007-12-31	5.6662
2008-12-31	4.4515
2009-12-31	0.6059
2010-12-31	0.5481
2011-12-31	0.6009
2012-12-31	0.4409