# year    value 
 1900    -0.16 
 1901     -0.1 
 1902    -2.66 
 1903    -0.13 
 1904     0.62 
 1905     0.82 
 1906     0.62 
 1907    -0.15 
 1908    -0.89 
 1909    -1.37 
 1910    -0.64 
 1911    -0.89 
 1912     0.03 
 1913     0.03 
 1914    -1.17 
 1915     0.51 
 1916     -0.9 
 1917    -0.88 
 1918    -1.24 
 1919    -1.05 
 1920        1 
 1921     0.54 
 1922    -0.42 
 1923    -0.88 
 1924     0.27 
 1925    -0.42 
 1926     1.11 
 1927    -0.99 
 1928    -0.56 
 1929     -1.1 
 1930    -0.34 
 1931    -0.47 
 1932     0.83 
 1933    -0.54 
 1934        0 
 1935    -0.21 
 1936      0.2 
 1937     0.02 
 1938     1.43 
 1939      0.3 
 1940     1.23 
 1941    -0.91 
 1942    -0.74 
 1943     2.06 
 1944     0.61 
 1945     0.17 
 1946    -0.15 
 1947     0.71 
 1948     0.56 
 1949      0.6 
 1950     0.33 
 1951     0.17 
 1952    -0.14 
 1953     1.56 
 1954     0.73 
 1955     -0.8 
 1956    -0.53 
 1957     0.06 
 1958    -0.71 
 1959     0.01 
 1960    -0.05 
 1961    -0.51 
 1962     0.92 
 1963    -0.69 
 1964    -2.03 
 1965     0.64 
 1966     -1.3 
 1967     1.09 
 1968     0.95 
 1969    -0.82 
 1970    -0.12 
 1971     -0.3 
 1972     -0.5 
 1973     0.41 
 1974     0.21 
 1975     1.19 
 1976     0.49 
 1977      0.5 
 1978    -0.16 
 1979    -0.48 
 1980     0.46 
 1981     1.05 
 1982     -0.1 
 1983     0.09 
 1984     0.59 
 1985    -0.52 
 1986     0.16 
 1987    -0.37 
 1988     0.94 
 1989     1.02 
 1990     2.88 
 1991        1 
 1992     0.25 
 1993     1.27 
 1994     0.82 
 1995     1.92 
 1996     1.38 
 1997     1.87 
 1998     1.05 
 1999      0.3 
 2000     1.88 
 2001     0.73 
 2002     1.47 
 2003     1.88 
 2004     0.72 
 2005     1.88 
 2006     0.86 
 2007     2.15 
 2008     1.46 
 2009     0.98 
 2010     2.42 
 2011      2.9 
 2012     1.58 
 2013     1.04 
 2014     2.83 
 2015     2.55 
 2016     3.45 
 2017     2.62 
 2018     1.19