# year value 1880 0.23 1881 -0.46 1882 0.87 1883 -0.4 1884 0.24 1885 0.85 1886 0.41 1887 -0.85 1888 0.23 1889 0.17 1890 -0.13 1891 -0.15 1892 0.03 1893 0.58 1894 0.37 1895 0.54 1896 0.12 1897 0.2 1898 0.46 1899 0.01 1900 -0.07 1901 -0.13 1902 -0.67 1903 -0.17 1904 -0.39 1905 -0.89 1906 -0.31 1907 -0.38 1908 -0.39 1909 -0.15 1910 0.04 1911 -0.14 1912 0.1 1913 0.19 1914 0.08 1915 -0.02 1916 -0.08 1917 -0.06 1918 -0.63 1919 -0.66 1920 -0.45 1921 -0.27 1922 0.03 1923 -0.83 1924 -0.28 1925 -0.48 1926 -0.28 1927 -0.25 1928 -0.12 1929 -0.57 1930 -0.36 1931 -0.68 1932 0.04 1933 -0.09 1934 -0.5 1935 -0.77 1936 -0.12 1937 -0.11 1938 0.22 1939 -0.39 1940 -0.04 1941 -0.18 1942 0.23 1943 -0.02 1944 0.43 1945 0.47 1946 -0.03 1947 0.29 1948 -0.1 1949 0.27 1950 -0.55 1951 -0.38 1952 0.31 1953 -0.16 1954 -0.35 1955 -0.18 1956 -0.1 1957 -0.25 1958 0.12 1959 -0.1 1960 0.15 1961 0.09 1962 0.46 1963 -0.35 1964 -0.06 1965 0.07 1966 -0.09 1967 0.14 1968 0.02 1969 -0.19 1970 0.07 1971 0.19 1972 0.11 1973 0.03 1974 -0.2 1975 -0.01 1976 -0.28 1977 0.47 1978 0.19 1979 -0.15 1980 0.4 1981 0.06 1982 0.21 1983 0.53 1984 0.37 1985 0.69 1986 0.21 1987 0.6 1988 0.4 1989 0.55 1990 0.3 1991 0.33 1992 0 1993 0.39 1994 0.32 1995 0.35 1996 0.52 1997 0.32 1998 0.6 1999 0.9 2000 0.03 2001 0.47 2002 0.3 2003 0.55 2004 0.76 2005 0.65 2006 0.75 2007 0.54 2008 0.86 2009 0.12 2010 0.57 2011 0.74 2012 0.72 2013 0.69 2014 0.91 2015 0.43 2016 1 2017 0.77 2018 0.7