# year value 1880 -0.91 1881 -0.74 1882 -0.59 1883 -0.53 1884 -0.64 1885 -0.55 1886 -0.49 1887 -0.55 1888 -0.36 1889 -0.53 1890 -0.49 1891 -0.65 1892 -0.36 1893 -0.16 1894 -0.48 1895 -0.06 1896 -0.39 1897 -0.14 1898 -0.38 1899 0.4 1900 0.03 1901 -0.21 1902 -0.67 1903 -0.46 1904 -0.22 1905 -0.09 1906 -0.3 1907 -0.45 1908 -0.48 1909 0.07 1910 -0.36 1911 -0.13 1912 -0.73 1913 -0.12 1914 -0.17 1915 -0.14 1916 -0.27 1917 -0.21 1918 -0.06 1919 -0.3 1920 -0.4 1921 -0.18 1922 -0.13 1923 0.22 1924 0.1 1925 -0.02 1926 0.14 1927 0.23 1928 0.15 1929 0.1 1930 0.08 1931 0.26 1932 0.07 1933 -0.1 1934 0.12 1935 -0.14 1936 0.13 1937 0.41 1938 0.51 1939 -0.03 1940 0.14 1941 -0.04 1942 0.21 1943 0.28 1944 0.3 1945 0.11 1946 0.04 1947 0.36 1948 0.2 1949 0.12 1950 -0.3 1951 0.15 1952 -0.17 1953 0.08 1954 0.21 1955 -0.08 1956 -0.46 1957 0.06 1958 0.02 1959 -0.06 1960 0 1961 0.02 1962 0.12 1963 0.36 1964 -0.28 1965 -0.13 1966 -0.08 1967 0.13 1968 -0.13 1969 0.06 1970 -0.01 1971 0.1 1972 -0.19 1973 0.08 1974 -0.26 1975 -0.01 1976 -0.41 1977 0.25 1978 0.09 1979 0.24 1980 0.28 1981 0.27 1982 0.02 1983 0.55 1984 -0.01 1985 0.07 1986 0.02 1987 0.31 1988 0.4 1989 0.29 1990 0.54 1991 0.47 1992 -0.17 1993 -0.09 1994 0.56 1995 0.72 1996 0.25 1997 0.7 1998 0.72 1999 0.67 2000 0.33 2001 0.84 2002 0.72 2003 0.89 2004 0.92 2005 1.22 2006 0.98 2007 0.96 2008 0.95 2009 0.93 2010 1.13 2011 0.96 2012 1.05 2013 1.03 2014 0.94 2015 1.29 2016 1.11 2017 1.16 2018 1.06