Year Percent 1996-01-01 1.1485900000000000 1997-01-01 0.9768070000000000 1998-01-01 0.7029810000000001 1999-01-01 1.5108600000000000 2000-01-01 1.0418800000000000 2001-01-01 1.0418800000000000 2002-01-01 0.7857900000000000 2003-01-01 0.7857900000000000 2004-01-01 2.7293700000000000 2005-01-01 2.3786300000000000 2006-01-01 2.2672800000000000 2007-01-01 1.5690800000000000 2008-01-01 2.6800300000000000 2009-01-01 1.4079400000000000 2010-01-01 1.4892800000000000 2011-01-01 1.9700700000000000 2012-01-01 2.2596500000000000 2013-01-01 2.3784700000000000 2014-01-01 2.2936900000000002 2015-01-01 2.2577400000000000 2016-01-01 2.5445200000000000