# year value 1880 -0.86 1881 -0.15 1882 -0.36 1883 -0.77 1884 -0.62 1885 -1.11 1886 -0.44 1887 -1.08 1888 -0.79 1889 0.41 1890 -0.86 1891 -1.08 1892 -0.85 1893 -0.92 1894 -1.18 1895 -0.59 1896 -0.66 1897 -0.42 1898 -1.12 1899 -1.04 1900 -0.55 1901 -0.6 1902 -0.3 1903 -0.45 1904 -1.09 1905 -0.41 1906 0 1907 -0.71 1908 -0.72 1909 -0.72 1910 -0.46 1911 -0.61 1912 -0.09 1913 -0.84 1914 0.19 1915 0.15 1916 -0.2 1917 -1.22 1918 -0.98 1919 0.18 1920 -0.52 1921 -0.36 1922 -0.22 1923 -0.11 1924 -0.48 1925 -0.39 1926 -0.11 1927 -0.44 1928 -0.08 1929 -0.75 1930 -0.4 1931 -0.07 1932 -0.15 1933 0.08 1934 -0.26 1935 -0.46 1936 -0.16 1937 -0.33 1938 0.25 1939 -0.19 1940 -0.24 1941 0.21 1942 0.31 1943 -0.17 1944 -0.44 1945 -0.13 1946 -0.23 1947 -0.1 1948 -0.24 1949 -0.31 1950 -0.16 1951 -0.22 1952 0.1 1953 0.07 1954 -0.07 1955 -0.34 1956 -0.36 1957 0.01 1958 0.49 1959 0.16 1960 -0.39 1961 0.19 1962 -0.2 1963 -0.13 1964 0.07 1965 -0.28 1966 -0.02 1967 -0.03 1968 -0.41 1969 0.32 1970 0.2 1971 -0.28 1972 -0.08 1973 0.62 1974 -0.26 1975 -0.03 1976 -0.29 1977 0.1 1978 0.22 1979 0.18 1980 0.57 1981 0.34 1982 0.14 1983 0.69 1984 0.25 1985 0.37 1986 0.58 1987 0.59 1988 0.69 1989 0.27 1990 0.65 1991 0.54 1992 0.73 1993 0.51 1994 0.37 1995 0.41 1996 0.44 1997 0.16 1998 1.14 1999 0.48 2000 0.2 2001 0.43 2002 0.94 2003 0.71 2004 0.55 2005 1.03 2006 0.38 2007 0.77 2008 0.21 2009 0.68 2010 1.04 2011 0.32 2012 0.43 2013 0.77 2014 0.76 2015 0.8 2016 1.31 2017 0.98 2018 0.96 2019 1.2