# year    value 
 1900    -1.47 
 1901    -0.02 
 1902    -0.86 
 1903    -0.29 
 1904     0.76 
 1905    -0.11 
 1906     0.05 
 1907    -0.84 
 1908    -0.31 
 1909    -0.32 
 1910    -0.24 
 1911    -0.12 
 1912     0.31 
 1913     0.64 
 1914     0.61 
 1915    -0.16 
 1916     0.98 
 1917    -0.93 
 1918     0.76 
 1919    -1.09 
 1920     2.14 
 1921     0.67 
 1922     0.43 
 1923     0.33 
 1924      0.1 
 1925    -0.35 
 1926     0.15 
 1927     0.73 
 1928    -0.71 
 1929     -0.9 
 1930     0.41 
 1931    -0.58 
 1932    -1.38 
 1933     -0.4 
 1934     1.63 
 1935    -0.95 
 1936      0.7 
 1937     0.68 
 1938    -0.69 
 1939    -0.89 
 1940    -0.31 
 1941    -1.09 
 1942     0.06 
 1943     1.52 
 1944    -0.41 
 1945     1.88 
 1946     1.57 
 1947     1.77 
 1948     1.71 
 1949      0.2 
 1950     1.03 
 1951    -0.29 
 1952     0.73 
 1953     0.77 
 1954    -0.23 
 1955    -0.93 
 1956     -0.7 
 1957     0.14 
 1958    -0.99 
 1959     1.15 
 1960     0.52 
 1961     1.44 
 1962    -1.06 
 1963    -0.01 
 1964     0.25 
 1965    -0.65 
 1966     0.63 
 1967     0.49 
 1968     0.87 
 1969     0.18 
 1970    -1.28 
 1971    -0.02 
 1972     0.55 
 1973    -0.56 
 1974     0.24 
 1975      0.2 
 1976    -0.45 
 1977     0.52 
 1978    -0.39 
 1979     0.14 
 1980    -1.25 
 1981     1.09 
 1982    -0.16 
 1983     0.76 
 1984    -1.07 
 1985     0.17 
 1986     0.65 
 1987    -1.38 
 1988     0.48 
 1989     1.51 
 1990     1.44 
 1991    -0.23 
 1992     1.09 
 1993     0.96 
 1994     1.33 
 1995     0.09 
 1996    -0.12 
 1997     0.58 
 1998     0.88 
 1999      1.5 
 2000     2.03 
 2001     1.62 
 2002     1.56 
 2003     1.58 
 2004     0.19 
 2005     0.64 
 2006     0.49 
 2007     2.68 
 2008     1.11 
 2009     2.08 
 2010     0.53 
 2011     2.13 
 2012      1.8 
 2013     0.14 
 2014     1.87 
 2015     1.37 
 2016     1.14 
 2017     2.04 
 2018     2.32