# year    value 
 1900     0.16 
 1901     0.36 
 1902    -0.82 
 1903    -1.25 
 1904    -1.21 
 1905    -0.76 
 1906    -0.95 
 1907    -0.93 
 1908    -1.03 
 1909    -0.04 
 1910    -0.17 
 1911    -0.26 
 1912       -1 
 1913     0.11 
 1914    -0.06 
 1915    -1.79 
 1916    -0.44 
 1917    -0.39 
 1918      0.4 
 1919    -0.01 
 1920    -0.72 
 1921     0.27 
 1922     0.27 
 1923    -0.19 
 1924    -0.56 
 1925     0.07 
 1926     -0.2 
 1927    -1.01 
 1928    -0.91 
 1929     0.13 
 1930     0.43 
 1931     0.77 
 1932     0.27 
 1933     0.85 
 1934     1.24 
 1935     0.21 
 1936     1.83 
 1937     0.88 
 1938     0.43 
 1939     0.33 
 1940     0.12 
 1941    -0.14 
 1942     -0.4 
 1943     0.25 
 1944    -0.48 
 1945    -0.83 
 1946    -0.01 
 1947     0.06 
 1948    -0.09 
 1949        0 
 1950    -1.16 
 1951    -0.78 
 1952      0.4 
 1953     0.32 
 1954     0.38 
 1955    -0.09 
 1956     0.39 
 1957      0.2 
 1958    -0.05 
 1959     0.42 
 1960     0.09 
 1961     0.34 
 1962    -0.47 
 1963     0.45 
 1964    -0.04 
 1965     -0.5 
 1966    -0.06 
 1967    -0.53 
 1968     -0.6 
 1969     -0.1 
 1970     0.52 
 1971    -0.11 
 1972    -0.31 
 1973    -0.05 
 1974    -0.17 
 1975     -0.4 
 1976    -0.17 
 1977     0.31 
 1978     0.18 
 1979    -0.34 
 1980     0.75 
 1981     0.27 
 1982    -0.46 
 1983     0.61 
 1984     0.44 
 1985    -0.27 
 1986     0.14 
 1987    -0.06 
 1988        1 
 1989    -0.13 
 1990     0.38 
 1991     0.19 
 1992    -1.27 
 1993    -0.75 
 1994     0.29 
 1995     0.16 
 1996     0.25 
 1997      0.1 
 1998     0.59 
 1999    -0.02 
 2000     0.53 
 2001     0.83 
 2002     0.82 
 2003     0.84 
 2004    -0.85 
 2005     0.42 
 2006     1.37 
 2007     0.69 
 2008     0.19 
 2009    -0.29 
 2010     0.52 
 2011      1.3 
 2012      1.3 
 2013     0.54 
 2014     0.19 
 2015     0.85 
 2016     0.95 
 2017     0.69 
 2018     1.06