Year	Percent
1996-12-31	6.0447
1997-12-31	6.8788
1998-12-31	7.3628
1999-12-31	5.471
2000-12-31	6.129
2001-12-31	4.9861
2002-12-31	4.008
2003-12-31	3.6756
2004-12-31	4.58
2005-12-31	4.6958
2006-12-31	4.8046
2007-12-31	5.9612
2008-12-31	5.4661
2009-12-31	1.1675
2010-12-31	0.6967
2011-12-31	0.8999
2012-12-31	0.9885