# year    value 
 1900    -0.59 
 1901    -0.19 
 1902     0.44 
 1903     -0.4 
 1904    -0.63 
 1905    -0.29 
 1906    -0.85 
 1907    -0.25 
 1908    -0.09 
 1909    -0.88 
 1910    -0.69 
 1911    -0.69 
 1912      0.2 
 1913    -1.05 
 1914     0.72 
 1915    -0.42 
 1916     0.02 
 1917    -1.03 
 1918    -0.39 
 1919    -0.94 
 1920     0.08 
 1921    -0.06 
 1922    -0.69 
 1923    -0.24 
 1924    -0.23 
 1925    -0.44 
 1926     1.16 
 1927    -0.22 
 1928    -0.17 
 1929    -1.04 
 1930    -0.86 
 1931    -0.52 
 1932    -0.17 
 1933    -1.19 
 1934     0.31 
 1935     0.58 
 1936    -0.79 
 1937    -0.31 
 1938     0.11 
 1939     0.05 
 1940      0.8 
 1941     0.75 
 1942     0.03 
 1943     0.21 
 1944     0.56 
 1945    -0.78 
 1946     0.38 
 1947    -0.53 
 1948     0.28 
 1949    -0.17 
 1950    -0.55 
 1951    -0.64 
 1952      0.2 
 1953     0.12 
 1954    -0.03 
 1955    -0.37 
 1956    -0.28 
 1957    -0.73 
 1958     0.58 
 1959     0.41 
 1960     0.37 
 1961     0.44 
 1962     0.26 
 1963     0.93 
 1964    -0.23 
 1965    -0.27 
 1966    -0.02 
 1967     -0.3 
 1968    -0.29 
 1969    -1.04 
 1970     0.52 
 1971    -0.21 
 1972    -0.54 
 1973     0.21 
 1974    -0.32 
 1975    -0.22 
 1976      0.1 
 1977    -0.06 
 1978     0.29 
 1979     0.27 
 1980      0.6 
 1981     1.01 
 1982     0.46 
 1983     0.61 
 1984      0.1 
 1985    -0.25 
 1986     0.79 
 1987     1.02 
 1988     0.76 
 1989     0.73 
 1990     0.73 
 1991     0.79 
 1992     0.76 
 1993      0.6 
 1994      0.8 
 1995     1.28 
 1996     0.71 
 1997     1.04 
 1998     1.29 
 1999      1.5 
 2000     0.83 
 2001     0.71 
 2002     1.32 
 2003     1.23 
 2004     1.25 
 2005     0.52 
 2006     0.89 
 2007      1.5 
 2008     0.38 
 2009     0.98 
 2010     0.97 
 2011     0.58 
 2012     0.31 
 2013     0.64 
 2014      1.2 
 2015        2 
 2016     1.83 
 2017     1.75 
 2018      1.5