Year	Percent
2004-12-31	4.8
2005-12-31	4.61
2006-12-31	5.22
2007-12-31	6
2008-12-31	2.25
2009-12-31	0.41
2010-12-31	0.58
2011-12-31	0.76
2012-12-31	0.49