# year    value 
 1900    -0.03 
 1901      0.4 
 1902    -0.25 
 1903    -0.08 
 1904     -0.3 
 1905    -0.94 
 1906    -0.48 
 1907    -0.29 
 1908    -0.23 
 1909    -0.21 
 1910    -0.12 
 1911     -0.1 
 1912    -0.09 
 1913     0.21 
 1914     0.41 
 1915    -0.11 
 1916    -0.24 
 1917    -0.17 
 1918    -0.24 
 1919    -0.26 
 1920    -0.09 
 1921     0.06 
 1922     0.06 
 1923     -0.8 
 1924    -0.32 
 1925    -0.41 
 1926     -0.1 
 1927     0.11 
 1928     0.13 
 1929    -0.35 
 1930     0.01 
 1931    -0.64 
 1932        0 
 1933    -0.04 
 1934    -0.42 
 1935     -0.6 
 1936    -0.14 
 1937     0.14 
 1938      0.4 
 1939    -0.51 
 1940    -0.07 
 1941    -0.29 
 1942     0.16 
 1943    -0.15 
 1944     0.59 
 1945     0.22 
 1946     -0.2 
 1947     0.13 
 1948    -0.17 
 1949    -0.03 
 1950    -0.46 
 1951    -0.23 
 1952    -0.08 
 1953     -0.2 
 1954    -0.23 
 1955     -0.2 
 1956    -0.24 
 1957    -0.17 
 1958        0 
 1959     0.04 
 1960     0.01 
 1961     0.34 
 1962      0.3 
 1963    -0.23 
 1964    -0.37 
 1965     0.22 
 1966    -0.29 
 1967     0.33 
 1968    -0.02 
 1969    -0.19 
 1970    -0.03 
 1971     0.13 
 1972     0.21 
 1973     0.09 
 1974    -0.24 
 1975     0.09 
 1976    -0.35 
 1977     0.46 
 1978     0.19 
 1979     0.01 
 1980     0.49 
 1981     0.29 
 1982     0.36 
 1983      0.5 
 1984     0.29 
 1985      0.5 
 1986     0.17 
 1987     0.46 
 1988     0.54 
 1989     0.49 
 1990     0.53 
 1991     0.38 
 1992    -0.21 
 1993     0.27 
 1994     0.34 
 1995     0.35 
 1996     0.58 
 1997     0.43 
 1998     0.55 
 1999     0.83 
 2000     0.26 
 2001     0.34 
 2002      0.4 
 2003     0.41 
 2004     0.66 
 2005     0.59 
 2006     0.92 
 2007     0.71 
 2008     0.89 
 2009     0.47 
 2010     0.42 
 2011     0.85 
 2012     0.94 
 2013     0.83 
 2014     1.17 
 2015      0.7 
 2016     0.63 
 2017     1.03 
 2018     0.83