Year Percent 1996-01-01 12.12880000000000000 1997-01-01 10.55420000000000000 1998-01-01 6.43180000000000000 1999-01-01 1.67940000000000000 2000-01-01 0.12072900000000000 2001-01-01 0.05728300000000001 2002-01-01 1.31725000000000000 2003-01-01 9.60128999999999900 2004-01-01 14.94950000000000000 2005-01-01 9.99615000000000000 2006-01-01 11.74750000000000000 2007-01-01 11.68340000000000000 2008-01-01 6.46695000000000000 2009-01-01 12.05299999999999900 2010-01-01 14.01930000000000000 2011-01-01 12.81750000000000000 2012-01-01 13.88740000000000000 2013-01-01 13.44440000000000000 2014-01-01 12.22299999999999900 2015-01-01 10.62260000000000000 2016-01-01 10.89170000000000000