# year value 1880 -2.1 1881 -0.09 1882 0.37 1883 0.53 1884 0.28 1885 -0.04 1886 -1.39 1887 -1.37 1888 -2.64 1889 -1.49 1890 -1.3 1891 -3.99 1892 0.06 1893 -2.76 1894 -0.53 1895 -3.32 1896 -1.19 1897 0.49 1898 0.19 1899 1.57 1900 0.28 1901 -2.02 1902 1.15 1903 -0.06 1904 0.09 1905 -1.27 1906 -0.32 1907 -2.38 1908 -0.19 1909 -2.36 1910 1.19 1911 0.01 1912 1.31 1913 0.26 1914 -0.8 1915 0.38 1916 1.96 1917 -0.85 1918 -0.63 1919 0.55 1920 1.42 1921 1.29 1922 -1.11 1923 0.29 1924 -1.7 1925 1.34 1926 0.73 1927 -0.2 1928 0.18 1929 -4.19 1930 0.87 1931 -0.5 1932 -1.68 1933 -0.58 1934 -1.38 1935 0.27 1936 1.25 1937 0.96 1938 -0.58 1939 0.45 1940 -2.6 1941 -2.03 1942 -3.46 1943 0.76 1944 -0.12 1945 -1.25 1946 -0.03 1947 -2.74 1948 0.95 1949 0.45 1950 0.65 1951 0.93 1952 -0.42 1953 -0.86 1954 -1.77 1955 1.23 1956 -1.63 1957 0.58 1958 0.74 1959 0.72 1960 0.72 1961 1.16 1962 0.04 1963 -3.87 1964 -1.51 1965 -0.93 1966 1.16 1967 -0.04 1968 -0.46 1969 -1.15 1970 -1.13 1971 -0.14 1972 1.06 1973 0.18 1974 1.62 1975 1.76 1976 0.4 1977 1.14 1978 0.03 1979 -0.11 1980 0.86 1981 -1.5 1982 -0.32 1983 0.78 1984 -0.07 1985 -1.76 1986 -0.27 1987 -1.06 1988 2 1989 1.26 1990 2.17 1991 -0.53 1992 0.03 1993 0.42 1994 1.86 1995 1.85 1996 -0.05 1997 0.74 1998 2.42 1999 -0.09 2000 0.7 2001 2.33 2002 0.55 2003 -0.25 2004 0.6 2005 -0.36 2006 -0.97 2007 3.32 2008 1.69 2009 0.09 2010 -0.05 2011 0.17 2012 -0.04 2013 0.23 2014 2.8 2015 1.52 2016 2.84 2017 0.32 2018 1.11 2019 1.54