# year value 1880 -0.23 1881 -0.47 1882 -0.56 1883 -0.16 1884 -0.4 1885 -0.29 1886 -0.4 1887 -0.69 1888 -0.34 1889 -0.31 1890 -0.74 1891 -0.06 1892 -0.37 1893 -0.41 1894 -0.41 1895 -0.14 1896 0.11 1897 0.29 1898 -0.01 1899 0.2 1900 0.05 1901 0.11 1902 0.11 1903 -0.08 1904 -0.52 1905 0.19 1906 -0.01 1907 -0.19 1908 -0.22 1909 -0.27 1910 -0.2 1911 -0.13 1912 -0.25 1913 -0.38 1914 0.06 1915 0.33 1916 -0.26 1917 -0.42 1918 -0.26 1919 -0.17 1920 -0.24 1921 -0.07 1922 -0.26 1923 -0.17 1924 0.09 1925 -0.1 1926 0.16 1927 -0.01 1928 0.05 1929 -0.24 1930 -0.11 1931 0.16 1932 -0.04 1933 -0.17 1934 -0.08 1935 -0.18 1936 -0.2 1937 0.01 1938 -0.2 1939 -0.15 1940 0.03 1941 0.29 1942 0.01 1943 -0.26 1944 0.11 1945 0.08 1946 -0.1 1947 0.12 1948 -0.02 1949 -0.05 1950 -0.29 1951 0.08 1952 -0.01 1953 0.06 1954 -0.22 1955 -0.27 1956 -0.35 1957 0.04 1958 0.09 1959 -0.01 1960 0.1 1961 -0.08 1962 0.03 1963 0.16 1964 -0.18 1965 -0.14 1966 0.18 1967 -0.15 1968 -0.07 1969 0.17 1970 0.07 1971 -0.29 1972 0.18 1973 0.19 1974 -0.11 1975 -0.19 1976 -0.2 1977 0.2 1978 0.02 1979 0.34 1980 0.32 1981 0.26 1982 0.3 1983 0.63 1984 0.15 1985 0.1 1986 0.24 1987 0.86 1988 0.38 1989 0.33 1990 0.4 1991 0.41 1992 0.32 1993 0.52 1994 0.28 1995 0.66 1996 0.45 1997 0.65 1998 1.05 1999 0.41 2000 0.46 2001 0.62 2002 0.86 2003 0.68 2004 0.61 2005 0.81 2006 0.79 2007 0.64 2008 0.5 2009 1.08 2010 0.89 2011 0.92 2012 0.79 2013 0.69 2014 1.03 2015 1.16 2016 1.13 2017 1.08 2018 0.93