# year value 1880 -0.98 1881 -0.73 1882 -0.04 1883 0.39 1884 -0.7 1885 -0.81 1886 0.64 1887 -0.24 1888 0.11 1889 0.84 1890 -0.4 1891 -0.79 1892 -0.73 1893 -0.55 1894 -0.41 1895 -0.98 1896 0.46 1897 -0.42 1898 0.47 1899 -1 1900 -0.02 1901 0.05 1902 -0.67 1903 -0.38 1904 -0.48 1905 -0.27 1906 -0.42 1907 -1.41 1908 -0.78 1909 -0.19 1910 0.09 1911 -0.61 1912 -1.2 1913 -0.61 1914 -0.38 1915 -0.69 1916 -0.92 1917 0.07 1918 0.33 1919 0.49 1920 -0.39 1921 0.05 1922 0.75 1923 -0.64 1924 -0.01 1925 -0.13 1926 0.51 1927 -0.27 1928 -0.43 1929 0.25 1930 0.18 1931 1 1932 -0.15 1933 0.8 1934 0.49 1935 0.22 1936 1.05 1937 0.32 1938 0.13 1939 0.18 1940 1 1941 -0.48 1942 0 1943 -0.56 1944 -0.94 1945 -0.37 1946 0.19 1947 -0.6 1948 -0.36 1949 -0.29 1950 -0.56 1951 -0.43 1952 -0.14 1953 -0.23 1954 -0.57 1955 -0.38 1956 -0.15 1957 -0.08 1958 0.71 1959 0.58 1960 0.75 1961 1.37 1962 -0.51 1963 -0.45 1964 -0.46 1965 -0.83 1966 0.02 1967 0.3 1968 -0.54 1969 0.15 1970 0.7 1971 0.3 1972 0.25 1973 0.08 1974 0.34 1975 -0.63 1976 -0.76 1977 0.82 1978 -0.01 1979 0.01 1980 -0.21 1981 0.67 1982 -0.23 1983 -0.34 1984 -0.03 1985 0.65 1986 0.56 1987 -0.14 1988 0.88 1989 0.22 1990 0.5 1991 0.08 1992 0.04 1993 -1.31 1994 1.42 1995 -0.35 1996 1.03 1997 0.11 1998 0.48 1999 -0.12 2000 1.03 2001 1 2002 1.3 2003 1.81 2004 0.55 2005 0.52 2006 1.59 2007 1.7 2008 0.8 2009 0.38 2010 0.38 2011 0.61 2012 1.51 2013 1.68 2014 1.04 2015 1.73 2016 1.4 2017 1.83 2018 1.66