Year Percent 1996-01-01 0.027637000000000002 1997-01-01 0.033516000000000004 1998-01-01 0.196618000000000010 1999-01-01 0.218107000000000020 2000-01-01 0.220711000000000020 2001-01-01 0.152582000000000000 2002-01-01 0.441210000000000050 2003-01-01 0.199125000000000000 2004-01-01 0.230431000000000000 2005-01-01 0.173865000000000020 2006-01-01 0.766195000000000000 2007-01-01 0.694122999999999900 2008-01-01 1.079100000000000000 2009-01-01 1.369610000000000000 2010-01-01 1.494060000000000000 2011-01-01 1.606140000000000000 2012-01-01 1.455700000000000000 2013-01-01 1.240860000000000000 2014-01-01 1.188490000000000000 2015-01-01 1.160770000000000000 2016-01-01 1.309180000000000000