Year Percent 1982-01-01 1.10320000000000000 1983-01-01 0.98022500000000000 1984-01-01 0.88689400000000010 1985-01-01 0.85056000000000000 1986-01-01 0.68420100000000010 1987-01-01 0.55560300000000000 1988-01-01 0.44177600000000000 1989-01-01 0.28076999999999996 1990-01-01 0.07491600000000000 1991-01-01 0.07491600000000000 1992-01-01 0.07491600000000000 1993-01-01 0.07491600000000000 1994-01-01 0.07491600000000000 1995-01-01 0.07491600000000000 1996-01-01 0.46928700000000000 1997-01-01 0.10125500000000000 1998-01-01 0.37564400000000000 1999-01-01 0.53900500000000010 2000-01-01 0.27826500000000000 2001-01-01 0.25626600000000000 2002-01-01 0.07077500000000000 2003-01-01 0.68253999999999990 2004-01-01 0.45990699999999995 2005-01-01 0.39061599999999996 2006-01-01 0.92564699999999990 2007-01-01 1.08322000000000000 2008-01-01 2.36455000000000000 2009-01-01 1.34202999999999980 2010-01-01 1.90152000000000000 2011-01-01 0.91405800000000000 2012-01-01 0.59789900000000000 2013-01-01 0.79948599999999990 2014-01-01 0.76455100000000000 2015-01-01 0.73649300000000010 2016-01-01 2.47964000000000030