# year    value 
 1900    -1.18 
 1901    -0.34 
 1902     0.73 
 1903    -0.13 
 1904    -0.56 
 1905    -1.48 
 1906    -0.85 
 1907     0.24 
 1908    -0.39 
 1909    -0.51 
 1910     0.08 
 1911     -0.7 
 1912      0.2 
 1913    -0.41 
 1914     0.96 
 1915    -0.38 
 1916     0.26 
 1917    -0.03 
 1918    -0.55 
 1919    -0.92 
 1920    -0.41 
 1921    -0.26 
 1922     0.28 
 1923    -0.36 
 1924     0.06 
 1925    -0.87 
 1926     0.88 
 1927    -0.76 
 1928     0.03 
 1929     -1.1 
 1930    -2.13 
 1931    -1.18 
 1932     0.24 
 1933    -1.06 
 1934    -0.31 
 1935     0.19 
 1936    -1.19 
 1937     -0.2 
 1938    -0.31 
 1939     0.33 
 1940     0.81 
 1941     1.42 
 1942     0.45 
 1943    -0.27 
 1944     0.54 
 1945    -2.46 
 1946     1.43 
 1947    -0.61 
 1948     0.32 
 1949     0.56 
 1950    -0.56 
 1951    -1.34 
 1952      1.1 
 1953     0.04 
 1954     0.14 
 1955    -0.96 
 1956     0.01 
 1957    -1.35 
 1958     0.79 
 1959     0.54 
 1960     0.71 
 1961    -0.01 
 1962    -0.06 
 1963     0.55 
 1964    -0.83 
 1965     0.46 
 1966     1.28 
 1967    -0.72 
 1968    -1.16 
 1969    -1.07 
 1970     0.52 
 1971    -0.19 
 1972    -0.53 
 1973     0.68 
 1974    -0.59 
 1975    -0.31 
 1976     0.31 
 1977    -1.02 
 1978    -0.07 
 1979     1.52 
 1980     0.53 
 1981     0.86 
 1982     0.54 
 1983     0.02 
 1984    -0.83 
 1985     -0.3 
 1986      0.4 
 1987     1.43 
 1988     0.95 
 1989     0.76 
 1990     1.39 
 1991     0.89 
 1992     0.74 
 1993     1.25 
 1994     0.64 
 1995     0.84 
 1996     0.29 
 1997     1.11 
 1998     1.04 
 1999     2.34 
 2000     0.82 
 2001     1.35 
 2002     1.88 
 2003     1.07 
 2004      1.6 
 2005     0.52 
 2006      1.1 
 2007     1.86 
 2008    -0.47 
 2009     2.06 
 2010     1.24 
 2011     0.37 
 2012    -0.38 
 2013     0.84 
 2014     0.79 
 2015     1.63 
 2016     1.59 
 2017     2.37 
 2018     1.23