# year value 1880 -0.56 1881 -0.53 1882 -0.22 1883 -0.31 1884 -1.23 1885 -1.05 1886 -0.38 1887 -0.89 1888 -0.78 1889 -0.31 1890 0.81 1891 -0.26 1892 0.3 1893 -0.84 1894 -0.21 1895 -0.27 1896 -0.17 1897 -0.19 1898 -0.38 1899 -0.88 1900 0.07 1901 -0.08 1902 0.21 1903 -0.87 1904 -0.36 1905 -1.55 1906 -1.1 1907 0.54 1908 0.31 1909 0.14 1910 -0.33 1911 0.22 1912 -0.45 1913 -0.58 1914 0.02 1915 -0.01 1916 0.16 1917 -0.7 1918 -0.74 1919 -0.36 1920 -0.19 1921 0.18 1922 0.5 1923 0.37 1924 -0.39 1925 -0.39 1926 -0.34 1927 0.1 1928 0.26 1929 -0.14 1930 -0.37 1931 -0.25 1932 0.14 1933 -0.06 1934 -0.02 1935 -0.07 1936 -0.39 1937 0.27 1938 0.25 1939 0.27 1940 0.04 1941 0.86 1942 0.68 1943 -0.13 1944 0.17 1945 -0.63 1946 0.77 1947 0.12 1948 0.15 1949 0.36 1950 0.26 1951 -0.38 1952 0.69 1953 0.2 1954 0.49 1955 -0.31 1956 -0.29 1957 -0.2 1958 0.04 1959 -0.04 1960 0.28 1961 -0.08 1962 -0.12 1963 -0.1 1964 -0.36 1965 -0.21 1966 0.47 1967 -0.16 1968 -0.8 1969 0.36 1970 0.19 1971 -0.04 1972 -0.24 1973 0.4 1974 -0.5 1975 0.01 1976 -0.35 1977 -0.26 1978 0.18 1979 0.59 1980 0.24 1981 0.3 1982 0.21 1983 -0.49 1984 -0.44 1985 0.1 1986 0.12 1987 0.59 1988 0.56 1989 0.05 1990 0.28 1991 0.7 1992 -0.37 1993 0.2 1994 0.65 1995 0.51 1996 0.42 1997 0.26 1998 0.98 1999 1.25 2000 0.29 2001 0.84 2002 1.01 2003 1.04 2004 0.66 2005 0.65 2006 1.05 2007 0.63 2008 0.27 2009 1.12 2010 1.15 2011 0.38 2012 0.32 2013 1.18 2014 0.45 2015 0.85 2016 0.98 2017 1.63 2018 1.07 2019 1.33