1959 0.82 1960 0.38 1961 -0.57 1962 0.91 1963 -0.48 1964 0.27 1965 0.48 1966 1.30 1967 1.05 1968 0.09 1969 1.03 1970 -1.19 1971 1.36 1972 1.49 1973 0.53 1974 0.16 1975 0.71 1976 0.71 1977 -1.09 1978 -0.98 1979 0.88 1980 -0.29 1981 -1.78 1982 0.95 1983 -2.11 1984 -0.97 1985 0.79 1986 -1.55 1987 -0.90 1988 0.02 1989 1.46 1990 1.09 1991 1.14 1992 -0.70 1993 0.14 1994 0.83 1995 0.06 1996 -0.42 1997 -0.06 1998 -1.06 1999 0.58 2000 0.09 2001 -0.59 2002 0.44 2003 -1.32 2004 0.23 2005 -0.08 2006 0.83 2007 0.73 2008 0.52 2009 2.24 2010 -0.59 2011 1.34 2012 1.04 2013 1.13 2014 0.85 2015 -0.15 2016 -0.57 2017 0.87