Year Percent 1996-01-01 0.8090330000000000 1997-01-01 0.6631580000000000 1998-01-01 0.7826290000000000 1999-01-01 0.8554860000000001 2000-01-01 0.8693820000000000 2001-01-01 1.7437799999999999 2002-01-01 1.4702500000000000 2003-01-01 0.8334159999999999 2004-01-01 1.3695100000000000 2005-01-01 1.0656400000000000 2006-01-01 1.1979100000000000 2007-01-01 1.2468700000000001 2008-01-01 0.9702590000000000 2009-01-01 1.3271000000000000 2010-01-01 1.1038299999999999 2011-01-01 1.2134100000000000 2012-01-01 1.2604000000000000 2013-01-01 1.2501799999999998 2014-01-01 1.0443600000000000 2015-01-01 1.7611200000000000 2016-01-01 1.5596500000000000