# year value 1880 -2.4 1881 -0.43 1882 -1.37 1883 -0.05 1884 0.71 1885 -1.56 1886 0.13 1887 -1.27 1888 -0.93 1889 -0.45 1890 0 1891 -0.33 1892 -1.66 1893 -0.6 1894 -1.22 1895 -0.73 1896 1.27 1897 -1.38 1898 -1.76 1899 -0.39 1900 -1.05 1901 0.36 1902 -1.38 1903 -0.22 1904 -0.41 1905 -0.54 1906 0.6 1907 -0.4 1908 -0.73 1909 -1.02 1910 0.34 1911 0.56 1912 -0.09 1913 -0.57 1914 0.48 1915 -1.17 1916 0.46 1917 -0.84 1918 0.02 1919 -0.81 1920 -0.72 1921 0.2 1922 0.24 1923 1.6 1924 1.05 1925 1.33 1926 1.39 1927 -0.54 1928 0.29 1929 1.48 1930 0.28 1931 1.5 1932 -0.48 1933 0.49 1934 1.03 1935 0.11 1936 1.52 1937 1.91 1938 2.04 1939 0.31 1940 0.04 1941 -0.31 1942 0.86 1943 1.86 1944 1.37 1945 0.27 1946 -0.14 1947 1.78 1948 0.17 1949 1.16 1950 -0.59 1951 1.21 1952 0.02 1953 0.96 1954 1.3 1955 -0.96 1956 -1.09 1957 0.64 1958 -1.04 1959 0.76 1960 -0.32 1961 -0.26 1962 -0.02 1963 0.26 1964 -0.46 1965 -0.51 1966 -0.52 1967 0.87 1968 -0.84 1969 0.06 1970 -0.4 1971 0.17 1972 -0.64 1973 -0.35 1974 -0.34 1975 0.06 1976 0.24 1977 -0.79 1978 1.18 1979 0.5 1980 0.37 1981 0.99 1982 -1.06 1983 0.11 1984 -0.06 1985 -0.01 1986 0.61 1987 0.04 1988 0.75 1989 -0.29 1990 -0.48 1991 1.37 1992 -1.3 1993 0.17 1994 0.53 1995 2.52 1996 -0.2 1997 0.93 1998 0.06 1999 0.68 2000 0.6 2001 0.68 2002 2.26 2003 1.74 2004 0.75 2005 2.05 2006 1.83 2007 2.23 2008 1.52 2009 1.18 2010 1.85 2011 0.79 2012 0.88 2013 1.24 2014 1.64 2015 1.67 2016 2.06 2017 1.55 2018 2.88