# year value 1900 -0.12 1901 0.08 1902 -0.42 1903 -0.48 1904 -0.5 1905 -0.21 1906 0 1907 -0.49 1908 -0.38 1909 -0.2 1910 -0.16 1911 -0.16 1912 -0.53 1913 -0.4 1914 -0.09 1915 -0.05 1916 -0.25 1917 -0.23 1918 -0.36 1919 -0.13 1920 -0.13 1921 0.05 1922 -0.15 1923 -0.24 1924 -0.09 1925 -0.18 1926 -0.16 1927 -0.01 1928 -0.17 1929 -0.27 1930 0.09 1931 0.22 1932 -0.04 1933 -0.09 1934 0.01 1935 -0.04 1936 0.19 1937 0.16 1938 0.12 1939 0.12 1940 0.11 1941 0.17 1942 0.05 1943 -0.05 1944 0.11 1945 0.05 1946 -0.06 1947 0.01 1948 0.07 1949 -0.11 1950 -0.18 1951 0.02 1952 0.1 1953 0.15 1954 -0.03 1955 -0.03 1956 -0.29 1957 0.01 1958 0.02 1959 0.11 1960 0.06 1961 0.08 1962 0 1963 0.03 1964 -0.19 1965 -0.21 1966 0.11 1967 -0.11 1968 -0.18 1969 0.01 1970 0.06 1971 -0.13 1972 -0.05 1973 0.24 1974 -0.05 1975 0.08 1976 -0.23 1977 0.18 1978 -0.1 1979 0.13 1980 0.19 1981 0.3 1982 0.06 1983 0.35 1984 0.13 1985 0.07 1986 0.13 1987 0.36 1988 0.53 1989 0.33 1990 0.43 1991 0.52 1992 -0.03 1993 0.25 1994 0.45 1995 0.62 1996 0.37 1997 0.57 1998 1.05 1999 0.6 2000 0.54 2001 0.78 2002 0.8 2003 0.79 2004 0.54 2005 0.9 2006 0.92 2007 0.78 2008 0.7 2009 0.76 2010 1.04 2011 0.91 2012 0.99 2013 0.87 2014 0.92 2015 1.1 2016 1.27 2017 1.16 2018 1.01