# year value 1880 -0.9 1881 0.45 1882 -0.62 1883 -0.58 1884 -0.54 1885 -0.08 1886 -0.38 1887 0.29 1888 0.04 1889 0.78 1890 -0.23 1891 -0.37 1892 -0.72 1893 -0.13 1894 0.16 1895 -0.08 1896 -0.85 1897 -0.48 1898 -1.08 1899 0.01 1900 0.22 1901 0.56 1902 -0.37 1903 -0.61 1904 -0.37 1905 -0.57 1906 0.18 1907 -0.28 1908 -0.48 1909 -0.81 1910 0.32 1911 -0.46 1912 -0.66 1913 -0.47 1914 0.36 1915 0.12 1916 -0.24 1917 -0.58 1918 0.09 1919 -0.31 1920 0.19 1921 -0.08 1922 -0.25 1923 -0.17 1924 -0.34 1925 0.36 1926 0.64 1927 -0.3 1928 0.03 1929 0.21 1930 0.28 1931 -0.18 1932 -0.17 1933 -0.84 1934 0.5 1935 -0.45 1936 -0.19 1937 -0.51 1938 0.73 1939 0.31 1940 0.62 1941 0.4 1942 0.16 1943 0.3 1944 0.44 1945 0.21 1946 0.3 1947 1.08 1948 0.27 1949 0.14 1950 0.05 1951 -0.19 1952 -0.07 1953 0.26 1954 -0.61 1955 -0.86 1956 -0.35 1957 -0.42 1958 0.11 1959 0.47 1960 -0.49 1961 0.54 1962 0.15 1963 0.15 1964 -0.09 1965 -0.2 1966 -0.01 1967 0.07 1968 0.7 1969 0.05 1970 -0.35 1971 -0.04 1972 0.4 1973 0.14 1974 0.18 1975 0.12 1976 -0.49 1977 0.4 1978 0.53 1979 0.17 1980 -0.33 1981 1.14 1982 0.15 1983 0.2 1984 0.23 1985 0.33 1986 0.51 1987 0.07 1988 0.27 1989 1.18 1990 1.25 1991 -0.02 1992 0.7 1993 0.63 1994 1.1 1995 0.36 1996 0.31 1997 1.49 1998 1.12 1999 0.52 2000 1.78 2001 1.65 2002 1.29 2003 0.68 2004 1.54 2005 1.22 2006 1 2007 1.68 2008 1.97 2009 1.29 2010 0.5 2011 0.98 2012 1.33 2013 1.41 2014 1.8 2015 1.74 2016 2.05 2017 2.03 2018 2.33 2019 1.57