Year Percent 2003-12-31 2.11 2004-12-31 2.06 2005-12-31 2.13 2006-12-31 2.93 2007-12-31 4.07 2008-12-31 4.27 2009-12-31 0.87 2010-12-31 0.5085 2011-12-31 1.0638 2012-12-31 0.2387