# year value 1880 -0.46 1881 -0.38 1882 0.52 1883 -0.25 1884 0.03 1885 0.69 1886 0.08 1887 -0.35 1888 0.46 1889 0.01 1890 -0.29 1891 -0.15 1892 -0.1 1893 0.31 1894 0.3 1895 0.47 1896 0.29 1897 0.07 1898 -0.18 1899 -0.35 1900 -0.03 1901 0.47 1902 -0.2 1903 -0.07 1904 -0.28 1905 -0.95 1906 -0.5 1907 -0.28 1908 -0.21 1909 -0.22 1910 -0.14 1911 -0.1 1912 -0.11 1913 0.21 1914 0.45 1915 -0.12 1916 -0.26 1917 -0.19 1918 -0.19 1919 -0.19 1920 -0.03 1921 0.11 1922 0.07 1923 -0.79 1924 -0.33 1925 -0.4 1926 -0.08 1927 0.16 1928 0.17 1929 -0.32 1930 0.06 1931 -0.64 1932 -0.01 1933 -0.03 1934 -0.41 1935 -0.57 1936 -0.14 1937 0.18 1938 0.43 1939 -0.53 1940 -0.08 1941 -0.31 1942 0.15 1943 -0.17 1944 0.61 1945 0.18 1946 -0.23 1947 0.1 1948 -0.18 1949 -0.08 1950 -0.44 1951 -0.2 1952 -0.13 1953 -0.21 1954 -0.22 1955 -0.2 1956 -0.26 1957 -0.15 1958 -0.01 1959 0.06 1960 -0.01 1961 0.38 1962 0.27 1963 -0.21 1964 -0.42 1965 0.25 1966 -0.32 1967 0.36 1968 -0.03 1969 -0.19 1970 -0.04 1971 0.11 1972 0.22 1973 0.1 1974 -0.24 1975 0.11 1976 -0.36 1977 0.45 1978 0.19 1979 0.04 1980 0.51 1981 0.32 1982 0.38 1983 0.5 1984 0.28 1985 0.47 1986 0.16 1987 0.43 1988 0.57 1989 0.48 1990 0.56 1991 0.39 1992 -0.25 1993 0.26 1994 0.34 1995 0.35 1996 0.59 1997 0.45 1998 0.55 1999 0.82 2000 0.29 2001 0.32 2002 0.41 2003 0.39 2004 0.65 2005 0.58 2006 0.95 2007 0.74 2008 0.89 2009 0.53 2010 0.4 2011 0.86 2012 0.98 2013 0.85 2014 1.22 2015 0.75 2016 0.57 2017 1.07 2018 0.85