# year    value 
 1900     0.09 
 1901    -2.08 
 1902     1.19 
 1903    -0.14 
 1904     0.18 
 1905       -1 
 1906    -0.13 
 1907       -2 
 1908    -0.15 
 1909    -2.22 
 1910      1.4 
 1911    -0.04 
 1912     1.18 
 1913     0.14 
 1914    -0.82 
 1915     0.82 
 1916     2.18 
 1917    -0.96 
 1918    -0.63 
 1919     0.74 
 1920      1.4 
 1921     1.43 
 1922    -1.13 
 1923     0.46 
 1924    -1.66 
 1925     1.32 
 1926     0.74 
 1927     0.13 
 1928     0.31 
 1929    -4.25 
 1930     0.82 
 1931     -0.1 
 1932    -1.82 
 1933     -0.5 
 1934    -1.46 
 1935     0.36 
 1936     1.46 
 1937        1 
 1938    -0.47 
 1939     0.55 
 1940     -2.8 
 1941    -2.11 
 1942    -3.48 
 1943     0.78 
 1944    -0.11 
 1945    -1.05 
 1946     0.12 
 1947    -2.92 
 1948     1.02 
 1949     0.41 
 1950     0.66 
 1951        1 
 1952    -0.26 
 1953    -0.86 
 1954    -1.77 
 1955     1.14 
 1956    -1.69 
 1957     0.64 
 1958     0.69 
 1959     0.64 
 1960     0.74 
 1961     1.06 
 1962     0.07 
 1963    -3.97 
 1964    -1.73 
 1965    -0.78 
 1966     1.17 
 1967     0.17 
 1968     -0.3 
 1969    -1.07 
 1970    -1.12 
 1971    -0.12 
 1972     1.01 
 1973     0.15 
 1974     1.56 
 1975     1.71 
 1976     0.37 
 1977     1.21 
 1978     0.01 
 1979    -0.29 
 1980     0.83 
 1981    -1.37 
 1982    -0.55 
 1983     0.69 
 1984    -0.07 
 1985    -2.01 
 1986    -0.35 
 1987     -1.2 
 1988     1.95 
 1989     1.19 
 1990     2.08 
 1991    -0.69 
 1992     0.06 
 1993     0.28 
 1994      1.7 
 1995     1.81 
 1996    -0.29 
 1997     0.52 
 1998     2.18 
 1999    -0.12 
 2000     0.74 
 2001     2.08 
 2002     0.41 
 2003    -0.44 
 2004     0.56 
 2005     -0.4 
 2006    -0.99 
 2007     3.18 
 2008     1.53 
 2009    -0.01 
 2010    -0.22 
 2011    -0.03 
 2012     0.06 
 2013     0.15 
 2014     2.64 
 2015     1.43 
 2016     2.72 
 2017     0.32 
 2018     0.97