# year    value 
 1900     0.37 
 1901     0.28 
 1902    -0.43 
 1903     -0.6 
 1904     1.26 
 1905     1.14 
 1906     0.08 
 1907    -0.11 
 1908     0.11 
 1909     -0.9 
 1910    -0.57 
 1911      1.2 
 1912    -0.81 
 1913    -1.62 
 1914    -0.87 
 1915    -0.12 
 1916    -0.78 
 1917     0.87 
 1918    -1.01 
 1919    -0.63 
 1920    -0.38 
 1921     0.83 
 1922     0.23 
 1923    -0.05 
 1924    -0.84 
 1925    -0.29 
 1926    -1.31 
 1927     0.54 
 1928     1.68 
 1929     0.73 
 1930     0.63 
 1931     0.58 
 1932     0.32 
 1933    -0.33 
 1934     0.25 
 1935     0.98 
 1936    -0.23 
 1937     0.59 
 1938     0.61 
 1939     0.19 
 1940    -1.04 
 1941    -0.25 
 1942     0.32 
 1943     0.89 
 1944     0.71 
 1945     1.42 
 1946     1.28 
 1947     2.07 
 1948     -0.7 
 1949      0.2 
 1950     2.26 
 1951     0.46 
 1952     1.96 
 1953     0.08 
 1954    -0.42 
 1955     -0.3 
 1956    -0.53 
 1957     0.31 
 1958     0.33 
 1959     0.36 
 1960    -0.33 
 1961     0.03 
 1962     0.05 
 1963     0.49 
 1964     0.73 
 1965     -0.5 
 1966    -0.38 
 1967     0.49 
 1968    -0.55 
 1969     -0.6 
 1970     0.34 
 1971     0.56 
 1972    -0.29 
 1973     0.47 
 1974     -0.1 
 1975    -0.13 
 1976    -0.13 
 1977    -0.56 
 1978    -1.05 
 1979    -0.07 
 1980    -0.74 
 1981     0.05 
 1982        1 
 1983     1.31 
 1984     -0.6 
 1985     0.23 
 1986     0.23 
 1987     0.18 
 1988     0.73 
 1989     0.25 
 1990      0.6 
 1991     0.98 
 1992     1.64 
 1993     0.77 
 1994     2.21 
 1995     0.87 
 1996     0.48 
 1997     0.66 
 1998     1.64 
 1999     1.11 
 2000     1.38 
 2001     1.22 
 2002     1.57 
 2003     4.06 
 2004        1 
 2005     0.89 
 2006     1.37 
 2007     1.57 
 2008     1.49 
 2009      1.7 
 2010     1.61 
 2011     1.29 
 2012     2.64 
 2013      1.9 
 2014     0.75 
 2015     3.13 
 2016     1.68 
 2017        3 
 2018     2.68