# year value 1880 -0.22 1881 -1.03 1882 0.46 1883 -1.3 1884 -0.42 1885 -1.03 1886 -0.81 1887 -0.71 1888 -1.09 1889 -0.5 1890 -0.33 1891 -0.93 1892 -0.13 1893 -1.92 1894 -0.49 1895 -1.11 1896 -0.32 1897 -0.46 1898 -0.19 1899 -0.19 1900 -0.67 1901 -0.03 1902 0 1903 -0.14 1904 -0.73 1905 -0.61 1906 -0.2 1907 -0.49 1908 -0.32 1909 -0.61 1910 -0.21 1911 -0.69 1912 -0.13 1913 -0.48 1914 0.63 1915 0.08 1916 0.1 1917 -1.05 1918 -0.81 1919 -0.4 1920 -0.2 1921 0.03 1922 -0.43 1923 -0.09 1924 -0.16 1925 -0.1 1926 0.66 1927 -0.18 1928 -0.11 1929 -0.73 1930 -0.44 1931 -0.2 1932 0.3 1933 -0.48 1934 -0.07 1935 0.32 1936 -0.48 1937 0.28 1938 0.17 1939 0.04 1940 0.24 1941 0.23 1942 -0.07 1943 0.07 1944 0.64 1945 -0.31 1946 -0.04 1947 -0.32 1948 0.2 1949 0.02 1950 -0.41 1951 -0.49 1952 0.33 1953 0.15 1954 -0.16 1955 0.1 1956 -0.44 1957 -0.26 1958 0.49 1959 0.22 1960 0.28 1961 0.37 1962 0.21 1963 0.27 1964 -0.06 1965 -0.25 1966 -0.06 1967 -0.36 1968 -0.13 1969 -0.57 1970 0.3 1971 -0.22 1972 -0.46 1973 0.38 1974 -0.29 1975 0.03 1976 -0.08 1977 -0.09 1978 0.19 1979 -0.03 1980 0.51 1981 0.75 1982 0.32 1983 0.73 1984 0.24 1985 -0.19 1986 0.45 1987 0.51 1988 0.71 1989 0.65 1990 0.59 1991 0.65 1992 0.63 1993 0.64 1994 0.26 1995 1.12 1996 0.48 1997 0.69 1998 1.1 1999 1.19 2000 0.95 2001 0.6 2002 1.27 2003 0.81 2004 1.17 2005 0.79 2006 0.85 2007 1.53 2008 0.65 2009 0.92 2010 0.88 2011 0.61 2012 0.69 2013 0.85 2014 0.94 2015 1.43 2016 2.04 2017 1.58 2018 1.34 2019 1.38