Year Percent 1996-01-01 8.45282000000000000 1997-01-01 7.02907000000000000 1998-01-01 2.98339000000000000 1999-01-01 7.62045000000000000 2000-01-01 9.17231000000000100 2001-01-01 6.74963000000000100 2002-01-01 4.90226000000000000 2003-01-01 5.04071000000000000 2004-01-01 4.96410000000000000 2005-01-01 3.07434000000000030 2006-01-01 3.62909000000000000 2007-01-01 4.78494000000000000 2008-01-01 3.65545999999999970 2009-01-01 0.17031400000000002 2010-01-01 1.21688000000000000 2011-01-01 2.15159000000000000 2012-01-01 0.78676899999999990 2013-01-01 1.47128000000000000 2014-01-01 0.75609300000000000 2015-01-01 0.90928999999999990 2016-01-01 2.19628000000000000