Year Percent 1996-01-01 1.5066400000000000 1997-01-01 1.4389600000000000 1998-01-01 1.5507700000000000 1999-01-01 1.4404000000000000 2000-01-01 1.5953400000000000 2001-01-01 1.2983200000000001 2002-01-01 1.2739900000000000 2003-01-01 1.2046600000000000 2004-01-01 1.1638100000000000 2005-01-01 1.0742100000000000 2006-01-01 1.0439900000000000 2007-01-01 0.9961969999999999 2008-01-01 0.9450100000000000 2009-01-01 1.0660300000000000 2010-01-01 0.9115120000000001 2011-01-01 0.9277479999999999 2012-01-01 0.9444070000000000 2013-01-01 0.9981070000000000 2014-01-01 1.0926300000000000 2015-01-01 0.9813200000000001 2016-01-01 0.7777220000000000