# year value 1880 -0.26 1881 -1.13 1882 0.6 1883 -1.65 1884 -0.35 1885 -1.19 1886 -0.93 1887 -1.08 1888 -1.17 1889 -0.69 1890 -0.52 1891 -1.28 1892 0.11 1893 -2.45 1894 -0.44 1895 -1.34 1896 -0.18 1897 -0.53 1898 -0.1 1899 0.28 1900 -1.02 1901 0.14 1902 0.44 1903 0.17 1904 -0.83 1905 -0.66 1906 -0.15 1907 -0.65 1908 -0.17 1909 -0.78 1910 -0.08 1911 -0.85 1912 -0.19 1913 -0.55 1914 1.28 1915 -0.09 1916 0.42 1917 -1.23 1918 -0.59 1919 -0.45 1920 -0.42 1921 0.31 1922 -0.83 1923 -0.35 1924 -0.19 1925 0.12 1926 1 1927 -0.36 1928 -0.58 1929 -1.91 1930 -0.87 1931 -0.6 1932 0.42 1933 -0.91 1934 -0.14 1935 0.49 1936 -0.92 1937 -0.14 1938 -0.02 1939 -0.09 1940 0.16 1941 0.47 1942 -0.73 1943 -0.12 1944 0.96 1945 -1.29 1946 0.24 1947 -1.02 1948 0.35 1949 0.31 1950 -0.87 1951 -0.61 1952 0.61 1953 0.25 1954 -0.47 1955 0.31 1956 -0.51 1957 -0.56 1958 1.22 1959 0.32 1960 0.62 1961 0.63 1962 0.48 1963 0.33 1964 -0.36 1965 -0.18 1966 0.57 1967 -0.73 1968 -0.25 1969 -1.66 1970 0.16 1971 -0.16 1972 -0.73 1973 0.15 1974 -0.05 1975 0.43 1976 0.41 1977 -0.71 1978 -0.13 1979 -0.19 1980 0.53 1981 1.09 1982 0.29 1983 1.4 1984 0.17 1985 -0.87 1986 0.44 1987 0.97 1988 0.72 1989 1.17 1990 1.31 1991 0.84 1992 1.29 1993 0.77 1994 0.38 1995 1.73 1996 0.2 1997 1.23 1998 1.61 1999 2.05 2000 1.67 2001 0.71 2002 2.23 2003 0.53 2004 1.72 2005 0.61 2006 0.68 2007 2.37 2008 0.46 2009 0.97 2010 0.5 2011 0.5 2012 0.41 2013 0.7 2014 0.94 2015 1.92 2016 2.7 2017 1.87 2018 1.21 2019 1.37