Year Percent 1996-01-01 7.9731000000000000 1997-01-01 10.3094000000000000 1998-01-01 8.3106700000000000 1999-01-01 10.5649000000000000 2000-01-01 10.6115000000000000 2001-01-01 5.0993000000000000 2002-01-01 1.2630900000000000 2003-01-01 7.6589800000000010 2004-01-01 11.5966000000000000 2005-01-01 13.2268000000000000 2006-01-01 17.6201000000000000 2007-01-01 16.4821000000000000 2008-01-01 0.9195830000000000 2009-01-01 8.7035100000000010 2010-01-01 9.8209200000000000 2011-01-01 9.3604100000000000 2012-01-01 8.0063500000000000 2013-01-01 8.8331500000000000 2014-01-01 6.7160899999999994 2015-01-01 8.8417100000000000 2016-01-01 8.9021300000000000