# year    value 
 1900      1.3 
 1901     0.33 
 1902    -0.12 
 1903    -0.58 
 1904     0.53 
 1905     0.48 
 1906    -0.16 
 1907     0.22 
 1908     0.02 
 1909    -0.88 
 1910     2.65 
 1911     0.27 
 1912     -1.1 
 1913    -0.29 
 1914     1.26 
 1915     0.58 
 1916      0.5 
 1917    -2.45 
 1918     0.03 
 1919      0.6 
 1920    -1.08 
 1921     0.27 
 1922     -1.2 
 1923    -0.36 
 1924    -0.11 
 1925      1.6 
 1926     1.54 
 1927    -0.18 
 1928     1.18 
 1929    -0.35 
 1930     0.67 
 1931     0.96 
 1932     0.03 
 1933    -0.89 
 1934     3.68 
 1935    -0.73 
 1936     1.42 
 1937      0.3 
 1938     0.12 
 1939     1.51 
 1940     1.86 
 1941     0.61 
 1942    -0.38 
 1943     0.82 
 1944    -0.53 
 1945    -0.57 
 1946     1.18 
 1947     1.38 
 1948     -0.7 
 1949     0.93 
 1950     -0.1 
 1951    -0.09 
 1952    -0.21 
 1953    -0.64 
 1954     0.68 
 1955    -1.22 
 1956     0.62 
 1957     0.11 
 1958     0.28 
 1959     0.41 
 1960     0.63 
 1961     0.37 
 1962    -0.02 
 1963     0.27 
 1964    -1.14 
 1965    -0.79 
 1966     1.16 
 1967    -0.47 
 1968     0.04 
 1969     0.44 
 1970    -0.74 
 1971    -0.44 
 1972     1.36 
 1973    -0.28 
 1974     0.66 
 1975     -1.7 
 1976    -0.13 
 1977    -0.21 
 1978     0.72 
 1979     0.35 
 1980    -0.06 
 1981     1.05 
 1982    -0.29 
 1983    -0.34 
 1984     0.45 
 1985     0.93 
 1986      1.7 
 1987     1.54 
 1988     0.88 
 1989     1.91 
 1990     1.41 
 1991    -0.38 
 1992     2.81 
 1993     1.33 
 1994     1.93 
 1995        0 
 1996     1.03 
 1997     1.36 
 1998    -0.01 
 1999     0.15 
 2000     2.07 
 2001     1.72 
 2002      0.6 
 2003     1.13 
 2004     2.43 
 2005     1.12 
 2006     1.25 
 2007      2.1 
 2008     0.01 
 2009     1.08 
 2010    -0.14 
 2011    -0.04 
 2012     2.03 
 2013      1.4 
 2014     1.64 
 2015     2.01 
 2016     2.02 
 2017     1.91 
 2018      1.9