# year value 1900 0.36 1901 0.34 1902 -0.14 1903 -0.13 1904 -0.58 1905 0.1 1906 0.24 1907 -0.39 1908 -0.59 1909 0.4 1910 -0.48 1911 -0.41 1912 -0.84 1913 -0.35 1914 -0.28 1915 0.93 1916 -0.28 1917 -0.21 1918 -0.42 1919 -0.31 1920 0.31 1921 -0.32 1922 0.23 1923 -0.37 1924 0.02 1925 0.21 1926 -0.37 1927 0.22 1928 -0.25 1929 -0.32 1930 -0.2 1931 0.06 1932 -0.1 1933 -0.02 1934 -0.73 1935 -0.05 1936 0.59 1937 -0.32 1938 0.06 1939 0.31 1940 0.43 1941 0.58 1942 0.8 1943 0.12 1944 -0.14 1945 0.84 1946 0.6 1947 0.29 1948 -0.26 1949 -0.22 1950 -0.67 1951 0.64 1952 -0.21 1953 0.09 1954 0.02 1955 0.1 1956 -0.25 1957 -0.24 1958 -0.01 1959 0.1 1960 -0.13 1961 -0.05 1962 -0.37 1963 0.29 1964 0.11 1965 0.21 1966 -0.45 1967 -0.83 1968 -0.09 1969 -0.07 1970 -0.18 1971 -0.05 1972 -0.16 1973 0.19 1974 0.14 1975 0.22 1976 -0.4 1977 0.57 1978 0.18 1979 0.01 1980 0.76 1981 -0.44 1982 0.13 1983 0.69 1984 -0.03 1985 -0.18 1986 -0.26 1987 0.3 1988 0.61 1989 0.47 1990 1 1991 0.24 1992 -0.34 1993 -0.06 1994 0.36 1995 0.73 1996 0.38 1997 0.21 1998 1.59 1999 1.21 2000 0.07 2001 1.01 2002 0.76 2003 0.7 2004 0.45 2005 1.07 2006 1.39 2007 0.7 2008 0.89 2009 0.75 2010 0.98 2011 0.96 2012 0.31 2013 0.81 2014 1.14 2015 1.12 2016 1.16 2017 1.35 2018 0.45