# year    value 
 1900     0.48 
 1901     0.37 
 1902    -0.45 
 1903    -0.58 
 1904     1.18 
 1905      1.2 
 1906     0.01 
 1907    -0.22 
 1908     0.14 
 1909    -0.82 
 1910    -0.47 
 1911     1.24 
 1912    -0.65 
 1913    -1.56 
 1914    -0.67 
 1915    -0.07 
 1916    -0.79 
 1917     1.03 
 1918    -1.01 
 1919    -0.72 
 1920    -0.27 
 1921     0.78 
 1922     0.22 
 1923    -0.23 
 1924    -0.77 
 1925    -0.16 
 1926    -1.47 
 1927     0.64 
 1928     1.45 
 1929     0.78 
 1930     0.65 
 1931     0.71 
 1932     0.29 
 1933    -0.48 
 1934     0.19 
 1935     0.93 
 1936    -0.18 
 1937     0.58 
 1938     0.63 
 1939      0.2 
 1940    -1.08 
 1941    -0.14 
 1942     0.32 
 1943     1.32 
 1944     0.72 
 1945     1.61 
 1946      1.1 
 1947     2.08 
 1948    -0.67 
 1949     0.17 
 1950     2.16 
 1951     0.35 
 1952     1.87 
 1953     0.04 
 1954    -0.51 
 1955    -0.19 
 1956     -0.6 
 1957     0.32 
 1958      0.2 
 1959     0.52 
 1960    -0.29 
 1961    -0.06 
 1962    -0.04 
 1963     0.41 
 1964     0.76 
 1965     -0.6 
 1966    -0.39 
 1967     0.46 
 1968    -0.52 
 1969    -0.53 
 1970     0.32 
 1971     0.55 
 1972    -0.36 
 1973      0.6 
 1974    -0.14 
 1975     0.01 
 1976     0.12 
 1977    -0.51 
 1978    -1.06 
 1979    -0.01 
 1980    -0.75 
 1981     0.02 
 1982     1.08 
 1983     1.38 
 1984     -0.6 
 1985     0.18 
 1986     0.31 
 1987      0.2 
 1988      0.7 
 1989      0.4 
 1990     0.73 
 1991     0.87 
 1992     1.59 
 1993      0.7 
 1994     2.23 
 1995     0.93 
 1996     0.36 
 1997     0.76 
 1998     1.48 
 1999     1.19 
 2000     1.29 
 2001     1.25 
 2002     1.46 
 2003     4.06 
 2004     0.99 
 2005      0.9 
 2006     1.49 
 2007      1.5 
 2008     1.46 
 2009     1.63 
 2010     1.56 
 2011     1.21 
 2012     2.46 
 2013     1.79 
 2014     0.78 
 2015     2.92 
 2016     1.64 
 2017     2.86 
 2018     2.74