# year value 1880 -1.01 1881 -0.92 1882 -0.61 1883 -0.6 1884 -0.73 1885 -0.61 1886 -0.64 1887 -0.42 1888 -0.4 1889 -0.76 1890 -0.36 1891 -0.58 1892 -0.28 1893 -0.05 1894 -0.38 1895 -0.07 1896 -0.8 1897 -0.16 1898 -0.34 1899 0.71 1900 0.13 1901 -0.34 1902 -0.65 1903 -0.5 1904 -0.07 1905 0.13 1906 -0.37 1907 -0.61 1908 -0.46 1909 0.31 1910 -0.39 1911 -0.2 1912 -1.22 1913 0.11 1914 -0.32 1915 -0.26 1916 -0.33 1917 0.11 1918 -0.02 1919 -0.46 1920 -0.58 1921 -0.21 1922 -0.17 1923 0.51 1924 0.19 1925 0 1926 0.09 1927 0.52 1928 0.13 1929 0.11 1930 0.18 1931 0.44 1932 0.28 1933 0.06 1934 0.24 1935 -0.13 1936 0.13 1937 0.38 1938 0.68 1939 0.05 1940 0.15 1941 -0.26 1942 0.25 1943 0.2 1944 0.15 1945 0.19 1946 0.09 1947 0.45 1948 0.31 1949 0.15 1950 -0.38 1951 -0.09 1952 -0.37 1953 0.04 1954 0.54 1955 0.13 1956 -0.35 1957 0.12 1958 0.07 1959 -0.48 1960 -0.01 1961 0.08 1962 0.07 1963 0.85 1964 -0.16 1965 -0.24 1966 -0.03 1967 0.14 1968 -0.11 1969 -0.09 1970 -0.03 1971 0.45 1972 -0.58 1973 0.05 1974 -0.19 1975 0.2 1976 -1 1977 0.38 1978 0.12 1979 0.21 1980 0.27 1981 0.06 1982 0.15 1983 0.7 1984 -0.16 1985 -0.36 1986 -0.27 1987 -0.08 1988 0.43 1989 0.35 1990 0.94 1991 0.45 1992 -0.15 1993 -0.81 1994 0.92 1995 0.66 1996 -0.16 1997 0.47 1998 0.71 1999 0.89 2000 0.04 2001 1.12 2002 0.52 2003 0.81 2004 1.17 2005 1.41 2006 1.07 2007 0.97 2008 1.06 2009 0.85 2010 1.27 2011 0.98 2012 1.02 2013 1.24 2014 0.79 2015 1.22 2016 0.85 2017 1.07 2018 0.82