# year value 1880 -0.37 1881 -0.61 1882 -0.51 1883 -0.07 1884 -0.46 1885 -0.55 1886 -0.42 1887 -0.74 1888 -0.11 1889 0 1890 -0.54 1891 0.06 1892 -0.39 1893 -0.42 1894 -0.42 1895 -0.26 1896 -0.02 1897 0.18 1898 -0.25 1899 0.19 1900 0.27 1901 -0.09 1902 0.25 1903 -0.04 1904 -0.26 1905 0.1 1906 0.14 1907 -0.29 1908 -0.14 1909 -0.43 1910 -0.19 1911 -0.11 1912 -0.01 1913 -0.39 1914 0.11 1915 0.42 1916 -0.16 1917 -0.25 1918 -0.03 1919 0.14 1920 -0.03 1921 -0.13 1922 -0.05 1923 0.23 1924 0.26 1925 -0.09 1926 0.33 1927 0.29 1928 0.1 1929 -0.19 1930 0.08 1931 0.18 1932 -0.03 1933 0.04 1934 -0.01 1935 0.07 1936 -0.14 1937 0.15 1938 -0.14 1939 0.44 1940 0.07 1941 0.59 1942 0.37 1943 0.18 1944 0.48 1945 0.5 1946 0.26 1947 0.17 1948 0.26 1949 -0.09 1950 -0.05 1951 0.15 1952 0.1 1953 0.48 1954 -0.2 1955 0.16 1956 -0.29 1957 -0.19 1958 0.03 1959 0.02 1960 0.08 1961 0.24 1962 0.1 1963 0.12 1964 -0.13 1965 -0.12 1966 0.22 1967 0.03 1968 -0.14 1969 -0.26 1970 -0.06 1971 -0.21 1972 -0.05 1973 0.09 1974 -0.13 1975 0.12 1976 -0.48 1977 0.12 1978 0.15 1979 0.08 1980 0.1 1981 0.29 1982 -0.03 1983 0.25 1984 0.1 1985 0.05 1986 0.04 1987 0.19 1988 0.42 1989 -0.05 1990 0.26 1991 0.27 1992 -0.14 1993 -0.17 1994 0.42 1995 0.49 1996 0.03 1997 0.51 1998 0.7 1999 0.48 2000 0.53 2001 0.6 2002 0.75 2003 0.35 2004 0.38 2005 0.87 2006 0.8 2007 0.82 2008 0.51 2009 0.74 2010 0.93 2011 0.85 2012 0.83 2013 0.77 2014 0.78 2015 0.79 2016 1.18 2017 1.06 2018 1.18