Year	Percent
2004-12-31	4.81
2005-12-31	4.6
2006-12-31	5.22
2007-12-31	6
2008-12-31	2.65
2009-12-31	0.43
2010-12-31	0.64
2011-12-31	0.82
2012-12-31	0.5