# year value 1880 -1.7 1881 -0.46 1882 -0.19 1883 0.61 1884 -0.5 1885 0.54 1886 -1.36 1887 -1.86 1888 -0.63 1889 -0.3 1890 -0.6 1891 -0.3 1892 -1.48 1893 -2.18 1894 -0.42 1895 -1.55 1896 0.48 1897 0.01 1898 -1.96 1899 -1.43 1900 -0.44 1901 0.58 1902 -0.59 1903 -0.27 1904 -0.65 1905 -0.52 1906 -0.48 1907 -1.03 1908 -0.74 1909 -0.71 1910 -0.13 1911 -1.51 1912 -0.26 1913 0.2 1914 -1.54 1915 -0.39 1916 0.58 1917 -0.26 1918 -1.14 1919 -1.25 1920 -0.6 1921 -1.12 1922 -0.78 1923 -1.32 1924 -1.4 1925 -0.39 1926 -0.22 1927 -0.33 1928 -0.38 1929 -0.12 1930 -0.79 1931 -0.87 1932 0.16 1933 -0.12 1934 -1.29 1935 -1.16 1936 -0.19 1937 -0.52 1938 0.15 1939 -0.59 1940 -0.89 1941 -0.38 1942 0.15 1943 -0.19 1944 0.92 1945 0.66 1946 0.17 1947 -0.18 1948 0.15 1949 -0.54 1950 -0.77 1951 0.14 1952 -0.47 1953 0.22 1954 -0.21 1955 -0.02 1956 -0.41 1957 -0.37 1958 0.06 1959 -0.16 1960 -0.21 1961 0.29 1962 0.41 1963 -0.05 1964 -0.43 1965 0.2 1966 -0.12 1967 -0.02 1968 0.15 1969 0.43 1970 0.33 1971 0.29 1972 0.07 1973 -0.43 1974 -0.36 1975 -0.14 1976 -0.05 1977 0.37 1978 0.35 1979 -0.02 1980 -0.07 1981 0.01 1982 0.37 1983 0.3 1984 0.37 1985 0.29 1986 0.19 1987 0.77 1988 0.54 1989 0.25 1990 0.59 1991 0.34 1992 0.09 1993 0.18 1994 0.83 1995 0.73 1996 0.39 1997 1.07 1998 0.5 1999 0.63 2000 0.25 2001 0.49 2002 0.81 2003 0.74 2004 0.65 2005 0.33 2006 0.88 2007 0.51 2008 0.76 2009 0.95 2010 0.52 2011 0.86 2012 1.19 2013 0.6 2014 1.19 2015 1.1 2016 0.73 2017 0.67 2018 0.96