# year value 1880 -1.18 1881 -0.65 1882 -1.49 1883 0.1 1884 -0.18 1885 -1.44 1886 -0.74 1887 -2.28 1888 -1.04 1889 -0.48 1890 -0.98 1891 -0.41 1892 -0.48 1893 -1.86 1894 -1.6 1895 -0.36 1896 -0.44 1897 0.31 1898 -1.39 1899 0.56 1900 -0.5 1901 -0.98 1902 0.8 1903 -1.13 1904 -0.61 1905 -0.78 1906 0.93 1907 -1.49 1908 -0.74 1909 -0.81 1910 -1.8 1911 -0.9 1912 -0.56 1913 0.05 1914 -0.97 1915 -0.52 1916 -0.18 1917 -1.62 1918 -0.94 1919 0.46 1920 0.46 1921 -0.42 1922 -1.31 1923 -0.94 1924 -1.38 1925 -0.42 1926 -0.27 1927 -0.49 1928 -0.88 1929 -0.48 1930 -0.09 1931 -1.12 1932 -0.32 1933 -0.18 1934 -0.73 1935 0.68 1936 0.15 1937 -0.4 1938 -0.81 1939 -0.5 1940 0.16 1941 -0.57 1942 -0.67 1943 -0.21 1944 -0.09 1945 0.83 1946 0.09 1947 -0.13 1948 -0.38 1949 0.1 1950 0 1951 -0.26 1952 0.4 1953 0.21 1954 -0.29 1955 -0.68 1956 -0.99 1957 0.45 1958 -0.01 1959 -0.35 1960 -0.26 1961 0.17 1962 -0.11 1963 0.07 1964 -0.19 1965 -0.14 1966 0.12 1967 0.59 1968 -0.69 1969 0.8 1970 0.48 1971 -0.65 1972 0.18 1973 0.31 1974 -0.07 1975 0.05 1976 -0.59 1977 0.22 1978 0.23 1979 -0.01 1980 0.78 1981 0.79 1982 0.43 1983 1.23 1984 0.2 1985 0.49 1986 0.44 1987 0.54 1988 0.26 1989 -0.05 1990 0.18 1991 0.89 1992 1.12 1993 0.61 1994 0.77 1995 0.52 1996 0.5 1997 1 1998 1.04 1999 0.01 2000 0.17 2001 0.31 2002 0.87 2003 0.61 2004 0.32 2005 0.43 2006 0.41 2007 0.19 2008 0.14 2009 1.17 2010 0.83 2011 0.39 2012 0.88 2013 0.59 2014 0.54 2015 1.49 2016 0.74 2017 0.91 2018 1.04 2019 0.79