Year Percent 1993-01-01 0.55263400000000010 1994-01-01 0.47869900000000000 1995-01-01 0.46920400000000000 1996-01-01 0.50272700000000000 1997-01-01 0.49464400000000000 1998-01-01 0.49163199999999996 1999-01-01 0.51709800000000000 2000-01-01 0.48874600000000000 2001-01-01 0.63498300000000000 2002-01-01 0.63505100000000000 2003-01-01 0.64544799999999990 2004-01-01 0.60974700000000000 2005-01-01 0.55231600000000000 2006-01-01 0.55769499999999990 2007-01-01 0.55573700000000000 2008-01-01 0.56336900000000000 2009-01-01 0.54273800000000000 2010-01-01 0.48692700000000005 2011-01-01 0.44406800000000000 2012-01-01 0.38881000000000000 2013-01-01 0.50522700000000010 2014-01-01 0.40834400000000000 2015-01-01 0.41634600000000000