# year value 1880 -0.18 1881 -0.03 1882 -0.19 1883 -0.3 1884 -0.77 1885 -0.48 1886 -0.29 1887 -0.23 1888 -0.56 1889 -0.22 1890 0.08 1891 -0.33 1892 0.01 1893 0.16 1894 -0.07 1895 -0.26 1896 0.02 1897 0.08 1898 0 1899 -0.13 1900 0.03 1901 0.42 1902 -0.49 1903 -0.65 1904 -0.54 1905 -0.22 1906 0.14 1907 -0.56 1908 -0.41 1909 -0.12 1910 -0.16 1911 0.06 1912 -0.71 1913 -0.48 1914 -0.15 1915 -0.4 1916 -0.13 1917 -0.16 1918 -0.28 1919 -0.18 1920 0.01 1921 0.32 1922 -0.03 1923 -0.19 1924 -0.11 1925 0 1926 -0.45 1927 0.03 1928 -0.31 1929 -0.01 1930 0.36 1931 0.48 1932 0.16 1933 0.19 1934 0.12 1935 0.22 1936 0.48 1937 0.54 1938 0.47 1939 0.44 1940 0.07 1941 -0.04 1942 0.08 1943 0.26 1944 0.23 1945 -0.07 1946 0.09 1947 0.08 1948 0.24 1949 0.11 1950 -0.21 1951 0.14 1952 0.48 1953 0.38 1954 0.09 1955 0.49 1956 -0.26 1957 -0.06 1958 -0.25 1959 0.18 1960 0.01 1961 0.25 1962 -0.09 1963 0.12 1964 -0.16 1965 -0.32 1966 0.15 1967 0.01 1968 -0.36 1969 -0.31 1970 0.04 1971 -0.16 1972 -0.23 1973 0.19 1974 -0.18 1975 0.34 1976 -0.19 1977 -0.01 1978 -0.25 1979 -0.01 1980 -0.01 1981 0.45 1982 -0.13 1983 0.41 1984 0.26 1985 -0.11 1986 0 1987 0.13 1988 0.75 1989 0.48 1990 0.46 1991 0.58 1992 -0.47 1993 -0.12 1994 0.61 1995 0.8 1996 0.38 1997 0.56 1998 1.1 1999 0.96 2000 0.72 2001 0.92 2002 0.78 2003 0.89 2004 0.43 2005 0.99 2006 1.21 2007 1.07 2008 0.97 2009 0.51 2010 1.64 2011 1.18 2012 1.57 2013 1 2014 0.95 2015 1.13 2016 1.48 2017 1.19 2018 1.39