# year    value 
 1900    -0.13 
 1901     0.49 
 1902    -0.28 
 1903    -0.38 
 1904     0.73 
 1905    -0.29 
 1906    -0.37 
 1907     0.03 
 1908    -0.39 
 1909     0.21 
 1910     0.54 
 1911    -1.26 
 1912    -0.92 
 1913    -0.13 
 1914     0.68 
 1915     0.04 
 1916    -1.19 
 1917     0.49 
 1918     -0.2 
 1919    -1.54 
 1920     -0.5 
 1921     0.48 
 1922     0.43 
 1923    -0.13 
 1924     0.02 
 1925    -1.09 
 1926    -0.11 
 1927     0.42 
 1928    -0.08 
 1929    -0.88 
 1930    -0.55 
 1931     0.49 
 1932    -0.18 
 1933     1.09 
 1934     0.89 
 1935    -0.73 
 1936    -0.16 
 1937     0.62 
 1938     0.37 
 1939      0.9 
 1940     0.26 
 1941    -0.14 
 1942     0.06 
 1943     0.34 
 1944     0.38 
 1945    -0.03 
 1946    -0.95 
 1947     0.26 
 1948    -0.08 
 1949      0.7 
 1950     0.48 
 1951    -0.75 
 1952     0.12 
 1953     1.28 
 1954     0.98 
 1955    -0.41 
 1956     0.23 
 1957    -0.86 
 1958      0.6 
 1959    -0.88 
 1960      0.5 
 1961    -1.16 
 1962     0.91 
 1963     1.96 
 1964    -0.21 
 1965      0.1 
 1966     0.26 
 1967     0.63 
 1968    -0.17 
 1969    -0.31 
 1970    -0.91 
 1971    -0.68 
 1972    -1.07 
 1973    -0.13 
 1974     0.01 
 1975    -0.36 
 1976    -0.67 
 1977     0.37 
 1978    -0.05 
 1979     0.32 
 1980     0.35 
 1981      0.6 
 1982     -0.7 
 1983     0.64 
 1984    -0.78 
 1985    -1.98 
 1986    -0.72 
 1987     0.64 
 1988     0.53 
 1989     0.23 
 1990     1.04 
 1991     -0.2 
 1992    -0.03 
 1993       -1 
 1994     0.02 
 1995     0.57 
 1996    -0.71 
 1997     0.55 
 1998     1.32 
 1999     1.18 
 2000    -0.67 
 2001     1.41 
 2002    -0.19 
 2003     0.56 
 2004     0.44 
 2005     1.05 
 2006    -0.12 
 2007     0.89 
 2008     0.76 
 2009     0.38 
 2010     0.65 
 2011     0.76 
 2012     1.06 
 2013     0.33 
 2014     0.86 
 2015      1.7 
 2016     2.07 
 2017     1.17 
 2018    -0.06