Year Percent 1996-01-01 0.7272730000000000 1997-01-01 0.8342020000000000 1998-01-01 0.9174310000000000 1999-01-01 1.0221500000000000 2000-01-01 1.9704400000000002 2001-01-01 2.0281700000000003 2002-01-01 2.0792100000000000 2003-01-01 1.8083200000000001 2004-01-01 1.4514900000000000 2005-01-01 1.8987300000000000 2006-01-01 2.9059800000000000 2007-01-01 3.3924100000000000 2008-01-01 4.9913200000000000 2009-01-01 1.7478200000000002 2010-01-01 1.4335400000000000 2011-01-01 1.8765200000000000 2012-01-01 0.3923670000000000 2013-01-01 0.6680030000000000 2014-01-01 0.7146050000000000 2015-01-01 0.6676230000000000 2016-01-01 0.7508699999999999