# year value 1880 -0.15 1881 -1.24 1882 -0.86 1883 -0.5 1884 -1.04 1885 -1.14 1886 -0.58 1887 -0.25 1888 -0.39 1889 -0.23 1890 -0.03 1891 -1.15 1892 -0.68 1893 -0.68 1894 0.11 1895 -0.26 1896 -0.1 1897 -0.34 1898 -0.05 1899 -0.89 1900 -0.4 1901 -0.23 1902 -0.79 1903 -0.57 1904 -0.25 1905 -0.56 1906 0.16 1907 -0.48 1908 -0.07 1909 -0.19 1910 -0.43 1911 -0.08 1912 -0.65 1913 -0.33 1914 -0.27 1915 0.34 1916 -0.28 1917 -0.2 1918 -0.94 1919 -0.12 1920 0.06 1921 0.08 1922 0.06 1923 0.13 1924 -0.31 1925 -0.34 1926 -0.44 1927 0.37 1928 -0.19 1929 -0.68 1930 0.04 1931 0.39 1932 0.22 1933 -0.39 1934 -0.28 1935 -0.07 1936 0.54 1937 0.2 1938 0.36 1939 -0.02 1940 0.1 1941 0.24 1942 -0.19 1943 0.2 1944 -0.44 1945 0.19 1946 -0.35 1947 -0.46 1948 0.06 1949 -0.77 1950 -0.49 1951 -0.26 1952 -0.17 1953 0.5 1954 0.56 1955 -0.17 1956 -0.28 1957 0.43 1958 -0.02 1959 0.13 1960 0.65 1961 0.26 1962 0.09 1963 -0.23 1964 -0.16 1965 -0.45 1966 0.12 1967 -0.05 1968 -0.44 1969 -0.15 1970 -0.26 1971 0.2 1972 -0.32 1973 0.54 1974 0.29 1975 0.22 1976 -0.25 1977 0.39 1978 -0.9 1979 -0.37 1980 0.05 1981 0.45 1982 -0.21 1983 0.14 1984 0.38 1985 0.11 1986 -0.36 1987 -0.33 1988 0.67 1989 0.48 1990 0.72 1991 0.88 1992 -0.44 1993 0.65 1994 0.43 1995 0.62 1996 -0.03 1997 0.31 1998 1.19 1999 0.25 2000 0.61 2001 1.08 2002 0.96 2003 1.12 2004 0.61 2005 1.08 2006 0.83 2007 1.15 2008 0.61 2009 0.56 2010 0.89 2011 0.96 2012 1.1 2013 1.21 2014 0.74 2015 0.51 2016 1.69 2017 0.77 2018 0.82