# year    value 
 1900    -1.53 
 1901     -0.1 
 1902    -0.83 
 1903    -0.48 
 1904     0.85 
 1905    -0.07 
 1906    -0.07 
 1907    -1.04 
 1908    -0.38 
 1909    -0.35 
 1910    -0.42 
 1911    -0.24 
 1912     0.23 
 1913     0.57 
 1914     0.58 
 1915    -0.02 
 1916     0.84 
 1917    -0.89 
 1918     0.66 
 1919    -1.14 
 1920     2.23 
 1921     0.73 
 1922     0.53 
 1923     0.39 
 1924     0.27 
 1925    -0.48 
 1926     0.12 
 1927     0.77 
 1928    -0.75 
 1929    -0.85 
 1930     0.45 
 1931    -0.46 
 1932    -1.39 
 1933    -0.28 
 1934     1.75 
 1935    -1.08 
 1936     0.79 
 1937     0.54 
 1938    -0.57 
 1939       -1 
 1940    -0.33 
 1941    -1.05 
 1942     0.18 
 1943      1.4 
 1944    -0.58 
 1945     1.82 
 1946     1.84 
 1947     2.11 
 1948     1.83 
 1949     0.23 
 1950     1.13 
 1951    -0.24 
 1952      0.7 
 1953     0.78 
 1954    -0.28 
 1955    -0.93 
 1956    -0.72 
 1957     0.18 
 1958    -0.91 
 1959     1.17 
 1960     0.53 
 1961     1.47 
 1962     -1.1 
 1963    -0.03 
 1964     0.33 
 1965     -0.7 
 1966     0.58 
 1967     0.46 
 1968     0.98 
 1969      0.3 
 1970    -1.46 
 1971    -0.06 
 1972     0.56 
 1973    -0.63 
 1974     0.22 
 1975     0.32 
 1976    -0.41 
 1977     0.62 
 1978    -0.51 
 1979     0.08 
 1980     -1.3 
 1981     1.13 
 1982    -0.25 
 1983     0.79 
 1984    -1.19 
 1985     0.07 
 1986     0.59 
 1987    -1.42 
 1988     0.42 
 1989     1.44 
 1990     1.37 
 1991    -0.26 
 1992     1.01 
 1993     0.95 
 1994      1.5 
 1995     0.11 
 1996    -0.03 
 1997     0.59 
 1998     0.84 
 1999     1.62 
 2000     2.08 
 2001     1.78 
 2002     1.64 
 2003     1.65 
 2004     0.21 
 2005     0.72 
 2006     0.49 
 2007     2.78 
 2008     1.11 
 2009     2.12 
 2010     0.62 
 2011     2.23 
 2012     1.91 
 2013     0.29 
 2014     1.93 
 2015     1.51 
 2016     1.19 
 2017     2.13 
 2018     2.45