# year    value 
 1900    -1.01 
 1901     -0.3 
 1902     0.82 
 1903     0.09 
 1904    -0.69 
 1905     -1.3 
 1906     -0.8 
 1907     0.26 
 1908    -0.54 
 1909    -0.32 
 1910     0.06 
 1911    -0.55 
 1912     0.34 
 1913    -0.32 
 1914     1.11 
 1915    -0.31 
 1916     0.13 
 1917    -0.15 
 1918    -0.62 
 1919    -0.89 
 1920    -0.37 
 1921    -0.27 
 1922      0.3 
 1923    -0.32 
 1924      0.2 
 1925    -0.84 
 1926     0.84 
 1927    -0.72 
 1928     -0.1 
 1929    -1.16 
 1930    -1.96 
 1931    -1.18 
 1932     0.34 
 1933    -1.03 
 1934    -0.46 
 1935     0.26 
 1936    -1.09 
 1937    -0.14 
 1938    -0.28 
 1939     0.18 
 1940     0.76 
 1941      1.4 
 1942      0.4 
 1943    -0.33 
 1944     0.65 
 1945    -2.35 
 1946     1.22 
 1947    -0.79 
 1948     0.34 
 1949     0.54 
 1950    -0.61 
 1951    -1.58 
 1952     1.16 
 1953     0.02 
 1954     0.06 
 1955    -0.81 
 1956     0.02 
 1957    -1.45 
 1958     1.08 
 1959     0.75 
 1960     0.68 
 1961        0 
 1962      0.1 
 1963     0.92 
 1964    -0.82 
 1965     0.57 
 1966     1.39 
 1967    -0.87 
 1968    -1.05 
 1969    -1.61 
 1970     0.62 
 1971     -0.3 
 1972    -0.84 
 1973     0.61 
 1974    -0.72 
 1975    -0.32 
 1976     0.46 
 1977    -1.28 
 1978     0.02 
 1979     1.47 
 1980     0.62 
 1981     0.83 
 1982     0.62 
 1983     0.45 
 1984    -0.98 
 1985    -0.38 
 1986     0.42 
 1987     1.33 
 1988     0.95 
 1989     0.95 
 1990     1.41 
 1991      0.8 
 1992     0.85 
 1993      1.4 
 1994     0.32 
 1995     0.92 
 1996     0.28 
 1997     1.04 
 1998      0.9 
 1999     2.19 
 2000      0.9 
 2001     1.14 
 2002     2.05 
 2003     0.93 
 2004     1.69 
 2005     0.49 
 2006     0.92 
 2007     2.02 
 2008    -0.64 
 2009      2.1 
 2010     1.03 
 2011     0.31 
 2012    -0.68 
 2013     0.64 
 2014     0.72 
 2015      1.7 
 2016     1.92 
 2017     2.34 
 2018     1.05