# year value 1880 -0.88 1881 -0.13 1882 -0.34 1883 -0.21 1884 -0.64 1885 -0.89 1886 0.46 1887 -0.41 1888 -0.2 1889 0.07 1890 -0.23 1891 -1.09 1892 -0.78 1893 -0.44 1894 -0.2 1895 -1.03 1896 0.28 1897 -0.46 1898 0.03 1899 -0.75 1900 0.09 1901 0.23 1902 -0.75 1903 -0.88 1904 -0.91 1905 -0.55 1906 -0.72 1907 -1.13 1908 -0.92 1909 -0.11 1910 -0.06 1911 -0.4 1912 -1.09 1913 -0.19 1914 -0.19 1915 -1.33 1916 -0.64 1917 -0.2 1918 0.37 1919 0.2 1920 -0.58 1921 0.18 1922 0.48 1923 -0.38 1924 -0.33 1925 -0.01 1926 0.1 1927 -0.69 1928 -0.71 1929 0.18 1930 0.33 1931 0.86 1932 0.09 1933 0.82 1934 0.92 1935 0.21 1936 1.5 1937 0.65 1938 0.3 1939 0.27 1940 0.49 1941 -0.28 1942 -0.24 1943 -0.09 1944 -0.68 1945 -0.63 1946 0.08 1947 -0.22 1948 -0.2 1949 -0.12 1950 -0.91 1951 -0.63 1952 0.17 1953 0.09 1954 -0.02 1955 -0.21 1956 0.17 1957 0.09 1958 0.27 1959 0.48 1960 0.37 1961 0.77 1962 -0.49 1963 0.07 1964 -0.22 1965 -0.64 1966 -0.03 1967 -0.18 1968 -0.57 1969 0 1970 0.59 1971 0.06 1972 -0.07 1973 0.01 1974 0.05 1975 -0.49 1976 -0.42 1977 0.52 1978 0.1 1979 -0.19 1980 0.34 1981 0.44 1982 -0.37 1983 0.21 1984 0.24 1985 0.11 1986 0.32 1987 -0.09 1988 0.95 1989 0.02 1990 0.43 1991 0.14 1992 -0.72 1993 -0.99 1994 0.77 1995 -0.05 1996 0.58 1997 0.1 1998 0.54 1999 -0.06 2000 0.74 2001 0.9 2002 1.02 2003 1.25 2004 -0.26 2005 0.46 2006 1.46 2007 1.12 2008 0.45 2009 -0.01 2010 0.46 2011 1.01 2012 1.39 2013 1.02 2014 0.55 2015 1.22 2016 1.14 2017 1.17 2018 1.31