# year value 1880 -1.83 1881 -0.94 1882 -0.58 1883 -2.49 1884 -0.12 1885 -1.02 1886 -0.78 1887 -1.92 1888 -0.28 1889 -0.98 1890 -1.38 1891 -0.25 1892 -0.18 1893 -1.3 1894 -0.27 1895 -1.8 1896 -0.91 1897 -0.45 1898 0.21 1899 -0.78 1900 0.46 1901 -0.93 1902 0.33 1903 -0.51 1904 -1.59 1905 -1.72 1906 -0.83 1907 -0.92 1908 -0.71 1909 -0.9 1910 -1.63 1911 -1.14 1912 -0.76 1913 -0.19 1914 -0.44 1915 -1.17 1916 -0.68 1917 -0.75 1918 -0.8 1919 -0.61 1920 -0.51 1921 -1.24 1922 -0.94 1923 -0.81 1924 -1.43 1925 0.04 1926 0.17 1927 -0.06 1928 -1.54 1929 -0.53 1930 0.27 1931 -0.15 1932 0.24 1933 -0.52 1934 -0.5 1935 -0.33 1936 -0.2 1937 0.12 1938 -0.28 1939 0.26 1940 -0.69 1941 -0.17 1942 0.44 1943 0.42 1944 -0.16 1945 0.52 1946 -0.13 1947 -0.01 1948 0.03 1949 0.23 1950 -0.18 1951 -0.71 1952 0.22 1953 0.1 1954 -0.02 1955 0.24 1956 -0.66 1957 -0.2 1958 0.32 1959 -0.36 1960 0.25 1961 0.2 1962 -0.08 1963 -0.04 1964 0.16 1965 -0.05 1966 -0.26 1967 -0.25 1968 0.12 1969 0.24 1970 0.27 1971 -0.52 1972 0.33 1973 0.57 1974 -0.69 1975 -0.33 1976 -0.17 1977 0.22 1978 0.04 1979 0.14 1980 0.43 1981 0.1 1982 0.14 1983 1.08 1984 0.35 1985 -0.08 1986 0.33 1987 0.66 1988 0.4 1989 0.72 1990 0.47 1991 0.23 1992 0.46 1993 0.23 1994 0.14 1995 0.73 1996 0.37 1997 0.2 1998 1.13 1999 0.45 2000 0.22 2001 0.56 2002 0.54 2003 0.73 2004 0.62 2005 0.75 2006 0.58 2007 0.8 2008 0.32 2009 0.55 2010 0.85 2011 0.39 2012 0.7 2013 0.81 2014 0.87 2015 0.59 2016 1.43 2017 1.26 2018 0.72 2019 0.7