# year value 1880 2.06 1881 -4.15 1882 1.98 1883 -0.67 1884 1.33 1885 -0.45 1886 -0.59 1887 1.48 1888 -1.96 1889 0 1890 -0.8 1891 0.59 1892 -2.75 1893 -1.29 1894 -1.56 1895 -1.56 1896 -1.45 1897 -1.58 1898 0.11 1899 -1.4 1900 -1.7 1901 -1.87 1902 0.87 1903 -1.59 1904 -0.39 1905 1.41 1906 -1.47 1907 -0.83 1908 0.07 1909 -1.69 1910 -0.55 1911 -0.52 1912 1.12 1913 -0.74 1914 1.06 1915 1.55 1916 -0.63 1917 -1.71 1918 -2.71 1919 -1.54 1920 1.55 1921 -0.22 1922 0.33 1923 0.76 1924 -0.21 1925 -1.21 1926 3.33 1927 0.52 1928 1.78 1929 2.06 1930 -0.53 1931 0.74 1932 -0.7 1933 -1.67 1934 0.22 1935 1.43 1936 -0.48 1937 1.26 1938 1.52 1939 0.16 1940 2.57 1941 0.5 1942 1.6 1943 1.06 1944 2.25 1945 1.74 1946 -0.11 1947 -0.53 1948 1.04 1949 -0.86 1950 0.38 1951 -1.27 1952 -0.65 1953 0.13 1954 -0.43 1955 -0.13 1956 -0.35 1957 0.24 1958 -0.34 1959 0.71 1960 0.64 1961 2.07 1962 1.13 1963 3.03 1964 1.07 1965 -1.63 1966 -2.98 1967 -0.49 1968 1.29 1969 -2.17 1970 1.16 1971 -1.08 1972 -1.43 1973 -0.26 1974 -0.73 1975 -0.55 1976 -0.19 1977 1.96 1978 0.91 1979 -0.89 1980 1.49 1981 2.76 1982 -0.11 1983 1.32 1984 0.93 1985 1.1 1986 3.24 1987 1.61 1988 0.98 1989 1.88 1990 -0.32 1991 0.73 1992 1.52 1993 1.83 1994 0.34 1995 1.7 1996 1.5 1997 1.68 1998 1.21 1999 -0.11 2000 1.41 2001 1.87 2002 0.55 2003 3.03 2004 1.65 2005 1.12 2006 1.4 2007 2.13 2008 1.7 2009 0.13 2010 1.68 2011 0.89 2012 1.62 2013 0.39 2014 3.5 2015 4.06 2016 4.31 2017 2.91 2018 3.72 2019 2.57