# year value 1900 -0.49 1901 0.64 1902 -0.27 1903 -0.15 1904 0.64 1905 -0.61 1906 -0.39 1907 0.29 1908 -0.77 1909 0.03 1910 0.67 1911 -1.39 1912 -1.47 1913 -0.28 1914 0.32 1915 -0.24 1916 -1.54 1917 0.93 1918 -0.01 1919 -1.55 1920 -1 1921 0.46 1922 0.02 1923 -0.41 1924 -0.26 1925 -1.04 1926 0.26 1927 0.38 1928 0.02 1929 -0.74 1930 -0.97 1931 -0.54 1932 0.39 1933 1.19 1934 0.84 1935 -0.51 1936 -0.28 1937 1.13 1938 -0.18 1939 0.58 1940 -0.03 1941 -0.69 1942 0.26 1943 0.71 1944 0.36 1945 0.02 1946 -1.29 1947 -0.03 1948 -0.44 1949 0.74 1950 0.9 1951 -0.46 1952 0.32 1953 1.22 1954 0.81 1955 -0.23 1956 -0.23 1957 -0.9 1958 0.5 1959 -0.43 1960 0.41 1961 -1.53 1962 1.03 1963 1.62 1964 -0.28 1965 0.22 1966 0.65 1967 1.06 1968 -0.3 1969 -0.4 1970 -1.06 1971 -1.36 1972 -1.04 1973 -0.3 1974 0.37 1975 -0.45 1976 -0.01 1977 0.36 1978 -0.29 1979 0.4 1980 0.3 1981 0.52 1982 -1.05 1983 0.5 1984 -0.99 1985 -2.13 1986 -0.8 1987 0.9 1988 0.93 1989 0.36 1990 0.98 1991 0.39 1992 0.13 1993 -0.68 1994 -0.53 1995 1.2 1996 -0.25 1997 0.6 1998 0.93 1999 1.29 2000 -0.97 2001 1.63 2002 -0.01 2003 0.9 2004 -0.01 2005 0.66 2006 0.02 2007 0.73 2008 1.08 2009 0.43 2010 0.61 2011 0.77 2012 1.55 2013 0.3 2014 1.47 2015 1.4 2016 1.7 2017 1.23 2018 0.39