# year value 1880 -0.36 1881 -0.67 1882 -0.6 1883 -0.95 1884 -1.57 1885 -0.2 1886 -0.24 1887 -0.46 1888 -0.17 1889 -0.52 1890 -0.42 1891 -0.46 1892 -0.94 1893 -0.33 1894 -0.61 1895 -0.07 1896 -0.1 1897 0.14 1898 -0.36 1899 0.29 1900 -0.11 1901 0.07 1902 -0.15 1903 -0.36 1904 -0.47 1905 0.27 1906 -0.11 1907 -0.32 1908 -0.49 1909 0.14 1910 -0.69 1911 -0.43 1912 -0.77 1913 -0.14 1914 -0.09 1915 0.75 1916 -0.5 1917 -0.5 1918 -0.16 1919 -0.22 1920 0.39 1921 -0.33 1922 -0.05 1923 -0.33 1924 -0.15 1925 0.39 1926 -0.44 1927 0.21 1928 -0.11 1929 -0.18 1930 -0.14 1931 -0.03 1932 -0.09 1933 -0.07 1934 -0.76 1935 -0.08 1936 0.58 1937 -0.21 1938 0.03 1939 0.18 1940 0.52 1941 0.58 1942 0.61 1943 0.01 1944 -0.16 1945 0.58 1946 0.51 1947 0.17 1948 -0.22 1949 -0.4 1950 -0.83 1951 0.59 1952 -0.42 1953 -0.01 1954 -0.08 1955 -0.01 1956 -0.31 1957 -0.12 1958 -0.18 1959 0.02 1960 -0.2 1961 -0.11 1962 -0.46 1963 0.4 1964 -0.06 1965 0.42 1966 -0.24 1967 -0.64 1968 -0.13 1969 0 1970 -0.19 1971 0.07 1972 -0.06 1973 0.05 1974 0.07 1975 0.09 1976 -0.5 1977 0.68 1978 0.3 1979 0.23 1980 0.78 1981 -0.47 1982 0.26 1983 0.59 1984 -0.04 1985 -0.2 1986 -0.14 1987 0.25 1988 0.67 1989 0.48 1990 0.98 1991 0.37 1992 -0.21 1993 -0.15 1994 0.48 1995 0.83 1996 0.29 1997 0.36 1998 1.5 1999 1.11 2000 0.16 2001 1.14 2002 0.77 2003 0.72 2004 0.7 2005 1.18 2006 1.56 2007 0.82 2008 1.05 2009 0.73 2010 1.14 2011 0.98 2012 0.33 2013 1.05 2014 1.08 2015 1.16 2016 0.93 2017 1.33 2018 0.54