Year Percent 1993-01-01 1.7201400000000002 1994-01-01 0.1005980000000000 1995-01-01 0.5032590000000000 1996-01-01 0.6138800000000000 1997-01-01 1.5131800000000000 1998-01-01 1.2222300000000000 1999-01-01 1.7234000000000000 2000-01-01 2.2890300000000000 2001-01-01 2.9415000000000000 2002-01-01 3.2309799999999997 2003-01-01 3.0220500000000000 2004-01-01 2.5137000000000000 2005-01-01 2.1371700000000002 2006-01-01 1.6474000000000000 2007-01-01 1.4583700000000002 2008-01-01 1.7170900000000002 2009-01-01 2.5670300000000000 2010-01-01 5.8372500000000000 2011-01-01 5.0409100000000000 2012-01-01 5.0960600000000000 2013-01-01 4.4799200000000000 2014-01-01 4.3314000000000000 2015-01-01 2.8638500000000000 2016-01-01 2.8204100000000000