# year    value 
 1900     0.59 
 1901     0.43 
 1902    -0.98 
 1903    -0.43 
 1904     0.08 
 1905    -0.18 
 1906    -1.21 
 1907    -1.32 
 1908     -0.3 
 1909    -0.49 
 1910     0.05 
 1911    -1.21 
 1912    -1.07 
 1913     1.06 
 1914     0.92 
 1915    -0.85 
 1916    -2.59 
 1917    -0.94 
 1918    -0.58 
 1919    -0.83 
 1920    -1.49 
 1921    -2.21 
 1922    -1.15 
 1923    -1.36 
 1924    -1.56 
 1925    -0.81 
 1926    -0.15 
 1927    -0.74 
 1928    -1.35 
 1929    -0.49 
 1930    -0.14 
 1931    -0.97 
 1932     0.37 
 1933    -0.65 
 1934     0.18 
 1935     0.06 
 1936    -0.37 
 1937     0.23 
 1938    -0.65 
 1939     1.17 
 1940     0.69 
 1941     0.47 
 1942    -1.34 
 1943    -0.45 
 1944     1.08 
 1945     0.75 
 1946    -0.38 
 1947    -0.29 
 1948    -0.11 
 1949    -0.51 
 1950     0.15 
 1951     0.86 
 1952    -0.62 
 1953     0.04 
 1954    -0.45 
 1955     -0.8 
 1956    -0.55 
 1957    -0.39 
 1958     0.47 
 1959     0.16 
 1960    -0.06 
 1961     0.28 
 1962    -0.62 
 1963     0.58 
 1964    -0.55 
 1965     0.76 
 1966    -0.09 
 1967    -0.56 
 1968     0.47 
 1969     0.29 
 1970    -0.07 
 1971    -0.13 
 1972     0.43 
 1973    -0.39 
 1974    -0.21 
 1975    -0.21 
 1976    -0.22 
 1977     0.42 
 1978     0.13 
 1979     0.54 
 1980     0.15 
 1981     0.13 
 1982     0.63 
 1983     0.01 
 1984    -0.28 
 1985     0.23 
 1986     0.68 
 1987     0.92 
 1988    -0.19 
 1989     0.47 
 1990      0.2 
 1991     0.31 
 1992     0.19 
 1993     0.25 
 1994     0.55 
 1995     0.41 
 1996     0.07 
 1997     1.45 
 1998     0.98 
 1999     0.02 
 2000        0 
 2001     0.58 
 2002     0.32 
 2003     0.39 
 2004     0.35 
 2005     0.73 
 2006     1.24 
 2007    -0.43 
 2008     0.72 
 2009     0.62 
 2010     0.15 
 2011     0.38 
 2012     0.52 
 2013     0.37 
 2014     0.86 
 2015     1.62 
 2016     0.97 
 2017     1.32 
 2018    -0.09