# year value 1880 -0.97 1881 -0.79 1882 -0.5 1883 -0.52 1884 -0.69 1885 -0.7 1886 -0.56 1887 -0.49 1888 -0.54 1889 -0.82 1890 -0.41 1891 -0.66 1892 -0.32 1893 0.02 1894 -0.51 1895 -0.07 1896 -0.83 1897 -0.16 1898 -0.41 1899 0.73 1900 0.16 1901 -0.5 1902 -0.79 1903 -0.5 1904 -0.16 1905 0.21 1906 -0.36 1907 -0.73 1908 -0.46 1909 0.41 1910 -0.44 1911 -0.23 1912 -1.07 1913 0.15 1914 -0.39 1915 -0.23 1916 -0.31 1917 0.07 1918 -0.03 1919 -0.49 1920 -0.58 1921 -0.3 1922 -0.13 1923 0.68 1924 0.23 1925 -0.13 1926 0.03 1927 0.46 1928 0.17 1929 0.12 1930 0.21 1931 0.54 1932 0.14 1933 -0.06 1934 0.3 1935 -0.12 1936 0.09 1937 0.41 1938 0.81 1939 -0.02 1940 0.18 1941 -0.36 1942 0.18 1943 0.13 1944 0.22 1945 0.03 1946 0.08 1947 0.51 1948 0.44 1949 0.09 1950 -0.33 1951 -0.25 1952 -0.35 1953 -0.01 1954 0.61 1955 0.14 1956 -0.35 1957 0.19 1958 0.02 1959 -0.61 1960 0 1961 0.21 1962 0.12 1963 0.94 1964 -0.14 1965 -0.31 1966 -0.06 1967 0.26 1968 -0.08 1969 -0.05 1970 0.1 1971 0.54 1972 -0.59 1973 0.01 1974 -0.17 1975 0.2 1976 -1.21 1977 0.35 1978 0.09 1979 0.2 1980 0.15 1981 0.21 1982 0.23 1983 0.67 1984 -0.1 1985 -0.3 1986 -0.31 1987 -0.13 1988 0.25 1989 0.3 1990 0.84 1991 0.43 1992 -0.14 1993 -1.03 1994 1.03 1995 0.56 1996 -0.17 1997 0.44 1998 0.6 1999 0.85 2000 0.15 2001 1.06 2002 0.5 2003 0.86 2004 1.25 2005 1.52 2006 1.1 2007 0.94 2008 1.05 2009 0.99 2010 1.29 2011 1.06 2012 1.05 2013 1.27 2014 0.65 2015 1.28 2016 0.91 2017 1.09 2018 0.75