Year Percent 1992-01-01 0.2648270000000000 1993-01-01 0.3898410000000000 1994-01-01 0.3285710000000000 1995-01-01 0.4076380000000000 1996-01-01 0.4633940000000000 1997-01-01 0.7913300000000000 1998-01-01 0.7849900000000000 1999-01-01 0.8514809999999999 2000-01-01 0.8670430000000000 2001-01-01 1.1724500000000000 2002-01-01 1.7119099999999998 2003-01-01 0.8562360000000001 2004-01-01 1.7604000000000000 2005-01-01 1.7280400000000002 2006-01-01 1.6371500000000000 2007-01-01 1.6560800000000000 2008-01-01 2.1020100000000000 2009-01-01 2.1534100000000000 2010-01-01 2.3812599999999997 2011-01-01 1.7899000000000000 2012-01-01 1.6466100000000000 2013-01-01 1.5788200000000001 2014-01-01 1.6844700000000001 2015-01-01 1.9005700000000000 2016-01-01 2.3481200000000000