# year    value 
 1900     0.44 
 1901     0.33 
 1902    -0.44 
 1903    -0.59 
 1904     1.22 
 1905     1.18 
 1906     0.04 
 1907    -0.18 
 1908     0.13 
 1909    -0.85 
 1910    -0.51 
 1911     1.22 
 1912    -0.71 
 1913    -1.59 
 1914    -0.74 
 1915    -0.09 
 1916    -0.79 
 1917     0.96 
 1918    -1.01 
 1919    -0.68 
 1920    -0.31 
 1921      0.8 
 1922     0.22 
 1923    -0.16 
 1924    -0.79 
 1925    -0.21 
 1926    -1.41 
 1927      0.6 
 1928     1.54 
 1929     0.76 
 1930     0.64 
 1931     0.66 
 1932      0.3 
 1933    -0.43 
 1934     0.21 
 1935     0.95 
 1936     -0.2 
 1937     0.58 
 1938     0.62 
 1939     0.19 
 1940    -1.07 
 1941    -0.18 
 1942     0.32 
 1943     1.16 
 1944     0.72 
 1945     1.55 
 1946     1.16 
 1947     2.08 
 1948    -0.68 
 1949     0.19 
 1950     2.19 
 1951     0.39 
 1952      1.9 
 1953     0.05 
 1954    -0.48 
 1955    -0.22 
 1956    -0.58 
 1957     0.32 
 1958     0.25 
 1959     0.47 
 1960     -0.3 
 1961    -0.03 
 1962    -0.01 
 1963     0.44 
 1964     0.75 
 1965    -0.57 
 1966    -0.38 
 1967     0.47 
 1968    -0.53 
 1969    -0.55 
 1970     0.32 
 1971     0.56 
 1972    -0.33 
 1973     0.56 
 1974    -0.13 
 1975    -0.04 
 1976     0.03 
 1977    -0.53 
 1978    -1.06 
 1979    -0.03 
 1980    -0.74 
 1981     0.03 
 1982     1.05 
 1983     1.36 
 1984     -0.6 
 1985      0.2 
 1986     0.28 
 1987     0.19 
 1988     0.71 
 1989     0.35 
 1990     0.68 
 1991     0.91 
 1992     1.61 
 1993     0.73 
 1994     2.22 
 1995     0.91 
 1996      0.4 
 1997     0.72 
 1998     1.54 
 1999     1.16 
 2000     1.32 
 2001     1.24 
 2002      1.5 
 2003     4.06 
 2004        1 
 2005      0.9 
 2006     1.45 
 2007     1.52 
 2008     1.47 
 2009     1.65 
 2010     1.57 
 2011     1.24 
 2012     2.52 
 2013     1.83 
 2014     0.78 
 2015     2.99 
 2016     1.65 
 2017     2.91 
 2018     2.72