# year    value 
 1900     0.13 
 1901     0.38 
 1902    -0.29 
 1903    -0.56 
 1904      0.8 
 1905    -0.06 
 1906    -0.36 
 1907    -0.15 
 1908    -0.11 
 1909     0.33 
 1910     0.45 
 1911    -1.16 
 1912    -0.52 
 1913    -0.02 
 1914     0.94 
 1915     0.24 
 1916    -0.94 
 1917     0.17 
 1918    -0.33 
 1919    -1.54 
 1920    -0.15 
 1921     0.48 
 1922     0.73 
 1923     0.07 
 1924     0.21 
 1925    -1.12 
 1926    -0.38 
 1927     0.46 
 1928    -0.14 
 1929    -0.98 
 1930    -0.25 
 1931     1.25 
 1932     -0.6 
 1933     1.02 
 1934     0.92 
 1935     -0.9 
 1936    -0.07 
 1937     0.26 
 1938     0.76 
 1939     1.13 
 1940     0.47 
 1941     0.26 
 1942    -0.08 
 1943     0.07 
 1944      0.4 
 1945    -0.06 
 1946    -0.69 
 1947     0.48 
 1948      0.2 
 1949     0.67 
 1950     0.17 
 1951    -0.97 
 1952    -0.02 
 1953     1.33 
 1954      1.1 
 1955    -0.54 
 1956     0.57 
 1957    -0.85 
 1958     0.67 
 1959     -1.2 
 1960     0.57 
 1961    -0.88 
 1962     0.83 
 1963      2.2 
 1964    -0.16 
 1965     0.02 
 1966    -0.03 
 1967     0.32 
 1968    -0.07 
 1969    -0.25 
 1970    -0.79 
 1971    -0.19 
 1972    -1.09 
 1973        0 
 1974    -0.26 
 1975    -0.29 
 1976    -1.14 
 1977     0.38 
 1978     0.12 
 1979     0.26 
 1980     0.39 
 1981     0.65 
 1982    -0.45 
 1983     0.75 
 1984    -0.63 
 1985    -1.87 
 1986    -0.67 
 1987     0.45 
 1988     0.24 
 1989     0.14 
 1990     1.07 
 1991    -0.62 
 1992    -0.15 
 1993    -1.23 
 1994     0.42 
 1995     0.11 
 1996    -1.05 
 1997     0.51 
 1998     1.61 
 1999     1.09 
 2000    -0.45 
 2001     1.25 
 2002    -0.32 
 2003     0.32 
 2004     0.78 
 2005     1.33 
 2006    -0.22 
 2007     1.02 
 2008     0.53 
 2009     0.34 
 2010     0.67 
 2011     0.75 
 2012      0.7 
 2013     0.35 
 2014     0.42 
 2015     1.92 
 2016     2.34 
 2017     1.14 
 2018    -0.38