# year value 1880 -0.6 1881 -0.29 1882 -0.68 1883 -0.73 1884 -0.4 1885 -1.53 1886 -0.87 1887 -0.61 1888 0.3 1889 0.03 1890 0.52 1891 -1.73 1892 1.55 1893 -1.88 1894 0.11 1895 -1.91 1896 0.44 1897 -1.06 1898 -0.16 1899 -1.2 1900 -1.67 1901 -0.44 1902 0.51 1903 -0.57 1904 -0.28 1905 -1.86 1906 -0.97 1907 0.2 1908 -0.01 1909 -0.95 1910 0.14 1911 -1.03 1912 -0.08 1913 -0.57 1914 0.65 1915 -0.52 1916 0.49 1917 0.15 1918 -0.44 1919 -0.98 1920 -0.5 1921 -0.25 1922 0.26 1923 -0.42 1924 -0.18 1925 -0.89 1926 0.94 1927 -0.81 1928 0.25 1929 -0.99 1930 -2.41 1931 -1.18 1932 0.09 1933 -1.1 1934 -0.1 1935 0.1 1936 -1.34 1937 -0.3 1938 -0.35 1939 0.52 1940 0.88 1941 1.46 1942 0.51 1943 -0.19 1944 0.4 1945 -2.58 1946 1.68 1947 -0.39 1948 0.3 1949 0.58 1950 -0.5 1951 -1.06 1952 1.04 1953 0.06 1954 0.24 1955 -1.12 1956 0.01 1957 -1.24 1958 0.49 1959 0.31 1960 0.75 1961 -0.03 1962 -0.24 1963 0.16 1964 -0.84 1965 0.34 1966 1.16 1967 -0.55 1968 -1.27 1969 -0.5 1970 0.42 1971 -0.06 1972 -0.19 1973 0.75 1974 -0.45 1975 -0.31 1976 0.14 1977 -0.73 1978 -0.18 1979 1.56 1980 0.44 1981 0.89 1982 0.46 1983 -0.44 1984 -0.67 1985 -0.2 1986 0.37 1987 1.53 1988 0.95 1989 0.56 1990 1.36 1991 1.01 1992 0.61 1993 1.06 1994 1.04 1995 0.75 1996 0.3 1997 1.2 1998 1.2 1999 2.5 2000 0.72 2001 1.61 2002 1.69 2003 1.23 2004 1.49 2005 0.55 2006 1.29 2007 1.68 2008 -0.3 2009 2.03 2010 1.47 2011 0.45 2012 -0.04 2013 1.07 2014 0.87 2015 1.56 2016 1.22 2017 2.4 2018 1.43 2019 0.93