# year value 1880 -0.39 1881 -0.75 1882 -0.69 1883 -1 1884 -1.67 1885 -0.1 1886 -0.17 1887 -0.51 1888 -0.13 1889 -0.68 1890 -0.46 1891 -0.6 1892 -0.98 1893 -0.33 1894 -0.7 1895 -0.02 1896 0.11 1897 0.04 1898 -0.34 1899 0.5 1900 -0.31 1901 -0.05 1902 -0.15 1903 -0.48 1904 -0.41 1905 0.34 1906 -0.26 1907 -0.29 1908 -0.45 1909 0.03 1910 -0.79 1911 -0.45 1912 -0.74 1913 -0.03 1914 0.01 1915 0.66 1916 -0.63 1917 -0.69 1918 -0.02 1919 -0.17 1920 0.45 1921 -0.34 1922 -0.21 1923 -0.3 1924 -0.25 1925 0.5 1926 -0.49 1927 0.21 1928 -0.02 1929 -0.1 1930 -0.1 1931 -0.09 1932 -0.08 1933 -0.11 1934 -0.78 1935 -0.09 1936 0.58 1937 -0.12 1938 0 1939 0.07 1940 0.59 1941 0.59 1942 0.46 1943 -0.07 1944 -0.18 1945 0.36 1946 0.45 1947 0.07 1948 -0.18 1949 -0.53 1950 -0.95 1951 0.55 1952 -0.6 1953 -0.09 1954 -0.17 1955 -0.1 1956 -0.36 1957 0 1958 -0.34 1959 -0.06 1960 -0.26 1961 -0.17 1962 -0.55 1963 0.51 1964 -0.21 1965 0.61 1966 -0.05 1967 -0.46 1968 -0.16 1969 0.06 1970 -0.2 1971 0.19 1972 0.03 1973 -0.06 1974 0 1975 -0.02 1976 -0.59 1977 0.78 1978 0.41 1979 0.44 1980 0.8 1981 -0.51 1982 0.39 1983 0.5 1984 -0.05 1985 -0.22 1986 -0.03 1987 0.21 1988 0.72 1989 0.48 1990 0.96 1991 0.47 1992 -0.11 1993 -0.22 1994 0.58 1995 0.91 1996 0.22 1997 0.5 1998 1.42 1999 1.04 2000 0.23 2001 1.25 2002 0.79 2003 0.74 2004 0.91 2005 1.28 2006 1.71 2007 0.93 2008 1.19 2009 0.71 2010 1.28 2011 1 2012 0.34 2013 1.25 2014 1.03 2015 1.19 2016 0.73 2017 1.31 2018 0.61