Year Percent 1996-01-01 2.5347200000000000 1997-01-01 1.2986300000000000 1998-01-01 1.6558700000000002 1999-01-01 1.6424200000000000 2000-01-01 2.5380500000000000 2001-01-01 1.7869599999999999 2002-01-01 1.4375799999999999 2003-01-01 1.1507600000000000 2004-01-01 0.5879550000000000 2005-01-01 3.4627900000000000 2006-01-01 3.3164300000000004 2007-01-01 2.2635400000000003 2008-01-01 2.0211200000000002 2009-01-01 2.0267500000000000 2010-01-01 2.0526200000000000 2011-01-01 2.0915400000000000 2012-01-01 1.8952600000000000 2013-01-01 1.9037200000000000 2014-01-01 1.9746000000000000 2015-01-01 1.5664400000000000 2016-01-01 1.8033800000000000