Year Percent 1995-01-01 0.57766300000000000 1996-01-01 0.35388000000000003 1997-01-01 0.52824399999999990 1998-01-01 0.63670300000000000 1999-01-01 0.41475400000000000 2000-01-01 0.68949500000000000 2001-01-01 3.99536000000000000 2002-01-01 7.60983999999999900 2003-01-01 8.41507000000000000 2004-01-01 6.93131000000000100 2005-01-01 6.76476000000000100 2006-01-01 6.78730000000000000 2007-01-01 5.23044000000000000 2008-01-01 3.45229000000000000 2009-01-01 4.18224000000000000 2010-01-01 4.10806000000000000 2011-01-01 2.76315000000000000 2012-01-01 2.62650000000000000 2013-01-01 2.00657000000000000