Year Percent 1982-01-01 0.25163700000000000 1983-01-01 0.25163700000000000 1984-01-01 0.25163700000000000 1985-01-01 0.25163700000000000 1986-01-01 0.25163700000000000 1987-01-01 0.25163700000000000 1988-01-01 0.25163700000000000 1989-01-01 0.25163700000000000 1990-01-01 0.25163700000000000 1991-01-01 0.25163700000000000 1992-01-01 -0.24734600000000000 1993-01-01 -0.24734600000000000 1994-01-01 -0.24734600000000000 1995-01-01 -0.24734600000000000 1996-01-01 -0.24734600000000000 1997-01-01 -0.24734600000000000 1998-01-01 0.41152299999999997 1999-01-01 0.41152299999999997 2000-01-01 0.41152299999999997 2001-01-01 0.41152299999999997 2002-01-01 0.41152299999999997 2003-01-01 0.41152299999999997 2004-01-01 0.48396800000000000 2005-01-01 0.48396800000000000 2006-01-01 0.48396800000000000 2007-01-01 1.54558000000000000 2008-01-01 -0.15965100000000000 2009-01-01 0.95088200000000000 2010-01-01 1.76287000000000020 2011-01-01 1.76287000000000020 2012-01-01 -0.73062700000000000 2013-01-01 0.13455699999999998 2014-01-01 0.13455699999999998 2015-01-01 1.86077000000000000