# year value 1880 -0.1 1881 -0.37 1882 0.04 1883 -0.12 1884 -1.03 1885 -0.69 1886 -0.63 1887 -0.62 1888 -0.67 1889 -0.19 1890 0.23 1891 -0.33 1892 0.09 1893 -0.75 1894 -0.18 1895 -0.37 1896 -0.22 1897 0.16 1898 -0.21 1899 -0.36 1900 0.18 1901 0.04 1902 -0.05 1903 -0.17 1904 -0.49 1905 -0.87 1906 -0.24 1907 0.05 1908 -0.2 1909 -0.08 1910 -0.4 1911 -0.31 1912 -0.12 1913 -0.33 1914 -0.14 1915 0.13 1916 -0.07 1917 -0.49 1918 -0.79 1919 0.2 1920 -0.34 1921 -0.15 1922 0.19 1923 -0.1 1924 0.04 1925 -0.49 1926 0.03 1927 0.1 1928 0.36 1929 -0.07 1930 -0.35 1931 0.15 1932 0.12 1933 0.05 1934 -0.31 1935 -0.11 1936 -0.04 1937 0.22 1938 0.17 1939 0.06 1940 -0.03 1941 0.56 1942 0.31 1943 -0.18 1944 0 1945 -0.29 1946 0.11 1947 0.13 1948 0.08 1949 -0.12 1950 -0.07 1951 -0.31 1952 0.15 1953 0.21 1954 0.12 1955 -0.1 1956 -0.22 1957 -0.36 1958 0.21 1959 0.12 1960 0.19 1961 -0.02 1962 -0.26 1963 0.08 1964 -0.08 1965 -0.14 1966 0.26 1967 -0.19 1968 -0.51 1969 0.39 1970 0.33 1971 -0.14 1972 -0.23 1973 0.39 1974 -0.44 1975 -0.21 1976 -0.39 1977 0.03 1978 0.21 1979 0.57 1980 0.26 1981 -0.05 1982 0.19 1983 -0.23 1984 -0.2 1985 0.18 1986 0.08 1987 0.33 1988 0.64 1989 -0.22 1990 0.32 1991 0.64 1992 -0.22 1993 0.18 1994 0.42 1995 0.21 1996 0.58 1997 0.35 1998 1.01 1999 0.85 2000 0.32 2001 0.5 2002 0.86 2003 0.9 2004 0.7 2005 0.75 2006 1.01 2007 0.65 2008 0.36 2009 1.01 2010 1.36 2011 0.61 2012 0.44 2013 1.07 2014 0.61 2015 0.74 2016 1.1 2017 1.3 2018 1.01 2019 1.06