# year    value 
 1900    -0.56 
 1901    -0.56 
 1902    -0.89 
 1903     -0.7 
 1904    -0.44 
 1905    -0.67 
 1906    -0.45 
 1907    -0.47 
 1908    -0.78 
 1909    -0.44 
 1910    -0.21 
 1911    -0.28 
 1912    -0.23 
 1913    -0.11 
 1914     0.16 
 1915    -0.02 
 1916    -0.84 
 1917    -0.14 
 1918    -0.46 
 1919    -0.03 
 1920    -0.34 
 1921    -0.31 
 1922    -0.37 
 1923    -0.75 
 1924    -0.48 
 1925    -0.65 
 1926    -0.19 
 1927    -0.37 
 1928     -0.1 
 1929    -0.44 
 1930    -0.24 
 1931    -0.46 
 1932    -0.24 
 1933    -0.23 
 1934     0.06 
 1935    -0.07 
 1936    -0.08 
 1937    -0.31 
 1938    -0.35 
 1939     0.17 
 1940     0.47 
 1941     0.52 
 1942    -0.28 
 1943    -0.48 
 1944    -0.02 
 1945     0.17 
 1946    -0.11 
 1947      0.1 
 1948    -0.29 
 1949     0.08 
 1950      0.1 
 1951     0.17 
 1952    -0.21 
 1953    -0.17 
 1954    -0.23 
 1955    -0.66 
 1956    -0.15 
 1957    -0.14 
 1958     0.19 
 1959     0.13 
 1960    -0.26 
 1961    -0.03 
 1962     0.26 
 1963        0 
 1964    -0.39 
 1965     0.07 
 1966    -0.21 
 1967    -0.28 
 1968     0.27 
 1969     0.13 
 1970     0.07 
 1971     -0.1 
 1972     -0.1 
 1973     0.06 
 1974      0.1 
 1975     0.18 
 1976    -0.17 
 1977     0.28 
 1978      0.2 
 1979     0.53 
 1980     0.29 
 1981     0.21 
 1982    -0.03 
 1983    -0.07 
 1984    -0.41 
 1985     0.66 
 1986     0.33 
 1987     0.53 
 1988      0.3 
 1989     0.17 
 1990     0.34 
 1991     0.31 
 1992    -0.09 
 1993     0.44 
 1994      0.4 
 1995    -0.17 
 1996     0.29 
 1997     0.45 
 1998     0.89 
 1999     0.59 
 2000     0.32 
 2001     0.45 
 2002     0.23 
 2003     0.55 
 2004      0.7 
 2005     0.69 
 2006     0.57 
 2007    -0.17 
 2008     0.39 
 2009     0.75 
 2010     0.19 
 2011     0.37 
 2012     0.34 
 2013      0.8 
 2014     0.93 
 2015     0.76 
 2016     0.65 
 2017     0.89 
 2018     0.26