# year value 1880 -0.24 1881 -0.11 1882 -0.17 1883 -0.22 1884 -0.75 1885 -0.47 1886 -0.26 1887 -0.22 1888 -0.47 1889 -0.1 1890 0.02 1891 -0.3 1892 0 1893 0.13 1894 -0.07 1895 -0.28 1896 0.08 1897 0.09 1898 0.06 1899 -0.16 1900 0.04 1901 0.37 1902 -0.5 1903 -0.58 1904 -0.44 1905 -0.16 1906 0.12 1907 -0.58 1908 -0.33 1909 -0.1 1910 -0.11 1911 0.01 1912 -0.71 1913 -0.48 1914 -0.13 1915 -0.34 1916 -0.14 1917 -0.08 1918 -0.19 1919 -0.09 1920 0 1921 0.29 1922 0.07 1923 -0.15 1924 -0.02 1925 0.02 1926 -0.27 1927 0.06 1928 -0.19 1929 -0.03 1930 0.33 1931 0.47 1932 0.1 1933 0.19 1934 0.12 1935 0.21 1936 0.39 1937 0.46 1938 0.41 1939 0.47 1940 0.08 1941 0.08 1942 0.12 1943 0.23 1944 0.24 1945 -0.02 1946 0.18 1947 0.07 1948 0.24 1949 0.09 1950 -0.09 1951 0.12 1952 0.41 1953 0.35 1954 0.06 1955 0.42 1956 -0.25 1957 -0.12 1958 -0.16 1959 0.18 1960 0.03 1961 0.27 1962 -0.05 1963 0.11 1964 -0.15 1965 -0.28 1966 0.14 1967 -0.01 1968 -0.33 1969 -0.28 1970 0.09 1971 -0.12 1972 -0.25 1973 0.15 1974 -0.13 1975 0.26 1976 -0.31 1977 0.04 1978 -0.17 1979 0 1980 0.06 1981 0.38 1982 -0.12 1983 0.22 1984 0.16 1985 -0.05 1986 0.09 1987 0.07 1988 0.65 1989 0.38 1990 0.45 1991 0.53 1992 -0.39 1993 -0.19 1994 0.7 1995 0.68 1996 0.38 1997 0.55 1998 1.07 1999 0.87 2000 0.79 2001 0.99 2002 0.88 2003 0.91 2004 0.49 2005 0.98 2006 1.19 2007 1.12 2008 1 2009 0.55 2010 1.47 2011 1.14 2012 1.49 2013 1.03 2014 0.95 2015 1.23 2016 1.47 2017 1.31 2018 1.44