Year Percent 1994-01-01 2.8448300000000000 1995-01-01 2.2981500000000000 1996-01-01 2.3182800000000000 1997-01-01 5.2121400000000000 1998-01-01 8.5649400000000000 1999-01-01 7.6959200000000000 2000-01-01 3.8120100000000000 2001-01-01 3.8120100000000000 2002-01-01 3.8120100000000000 2003-01-01 3.8120100000000000 2004-01-01 2.3554100000000000 2005-01-01 3.1864600000000000 2006-01-01 5.6322700000000000 2007-01-01 5.6766100000000000 2008-01-01 6.0462000000000000 2009-01-01 5.5672500000000000 2010-01-01 1.4712100000000001 2011-01-01 0.7665750000000000 2012-01-01 0.7095150000000000 2013-01-01 1.3580200000000000 2014-01-01 1.9829800000000000 2015-01-01 1.6351799999999999 2016-01-01 0.9910780000000000 2017-01-01 1.2824799999999998