Year Percent 1983-01-01 0.86526800000000000 1984-01-01 0.40173500000000000 1985-01-01 0.50850800000000000 1986-01-01 0.41301600000000000 1987-01-01 0.36439299999999997 1988-01-01 0.24929600000000000 1989-01-01 0.99002300000000000 1990-01-01 1.04056000000000000 1991-01-01 1.32657000000000000 1992-01-01 0.31815200000000000 1993-01-01 0.54608200000000000 1994-01-01 0.52427300000000000 1995-01-01 0.42779500000000000 1996-01-01 0.49478300000000000 1997-01-01 1.14412000000000000 1998-01-01 1.01290000000000000 1999-01-01 1.20916000000000000 2000-01-01 1.02078000000000000 2001-01-01 0.93051600000000000 2002-01-01 3.28986999999999960 2003-01-01 3.10044000000000030 2004-01-01 1.80144000000000020 2005-01-01 1.22942000000000020 2006-01-01 1.02097000000000020 2007-01-01 1.22197000000000000 2008-01-01 0.78927300000000000 2009-01-01 0.67831200000000000 2010-01-01 0.63657800000000000 2011-01-01 1.54484000000000000 2012-01-01 2.34609000000000020 2013-01-01 3.73410000000000000 2014-01-01 6.91020000000000000 2015-01-01 7.42168999999999900 2016-01-01 8.07761000000000000