# year value 1900 0.18 1901 0.13 1902 -0.22 1903 -0.83 1904 -0.67 1905 -0.05 1906 -0.48 1907 -0.57 1908 -0.4 1909 -0.41 1910 -0.74 1911 -0.85 1912 0.08 1913 -0.33 1914 -0.67 1915 -0.38 1916 0.19 1917 -0.7 1918 -0.29 1919 -0.22 1920 -0.18 1921 -0.75 1922 -0.63 1923 0.07 1924 -0.55 1925 -0.08 1926 0.28 1927 -0.07 1928 -0.2 1929 0.37 1930 -0.45 1931 -0.35 1932 -0.11 1933 -0.39 1934 -0.78 1935 -0.32 1936 -0.09 1937 -0.42 1938 -0.34 1939 -0.27 1940 -0.45 1941 0.34 1942 -0.26 1943 -0.34 1944 0.3 1945 0.2 1946 0.09 1947 -0.35 1948 -0.12 1949 -0.36 1950 -0.41 1951 0.32 1952 -0.21 1953 0.19 1954 -0.04 1955 -0.27 1956 -0.46 1957 0.21 1958 0.17 1959 0.04 1960 -0.04 1961 0.14 1962 0.12 1963 0.08 1964 -0.44 1965 -0.07 1966 0 1967 -0.13 1968 -0.03 1969 0.45 1970 0.04 1971 -0.24 1972 0.27 1973 -0.08 1974 -0.35 1975 -0.38 1976 -0.03 1977 0.29 1978 0.17 1979 0.17 1980 0.05 1981 -0.1 1982 0.37 1983 0.27 1984 0.23 1985 0.15 1986 0.12 1987 0.61 1988 0.19 1989 0.04 1990 0.2 1991 0.3 1992 0.25 1993 0.26 1994 0.62 1995 0.56 1996 0.32 1997 1.17 1998 0.42 1999 0.04 2000 0.24 2001 0.38 2002 0.71 2003 0.86 2004 0.83 2005 0.46 2006 0.84 2007 0.52 2008 0.62 2009 1.02 2010 0.68 2011 0.57 2012 0.97 2013 0.75 2014 1.02 2015 1.26 2016 0.76 2017 0.81 2018 0.98