# year    value 
 1901 -1.211036 
 1902 -0.5753786 
 1903 -2.229562 
 1904 -1.275064 
 1905 -2.453356 
 1906 -0.1028853 
 1907 -0.3108829 
 1908 0.7589757 
 1909 -0.4185649 
 1910 -3.013489 
 1911 -0.563911 
 1912 -2.380529 
 1913 -1.945659 
 1914 -0.1820003 
 1915 -1.716021 
 1916 -1.631289 
 1917 -2.867122 
 1918 -2.431529 
 1919 -0.3245673 
 1920 -1.161132 
 1921  1.19421 
 1922 -1.658295 
 1923 -0.5408504 
 1924 -0.2838532 
 1925 -1.392463 
 1926 1.030521 
 1927 -0.1227342 
 1928 -1.102968 
 1929 -3.027658 
 1930 -0.7443413 
 1931 1.928911 
 1932 -0.009111921 
 1933 -1.542886 
 1934 1.708605 
 1935 0.6998985 
 1936 -2.766758 
 1937 -2.745818 
 1938 -0.03470491 
 1939 -0.431759 
 1940 -0.3671536 
 1941 0.8956275 
 1942 0.2145054 
 1943 -0.15284 
 1944 0.4310933 
 1945 0.01990668 
 1946 -0.4051595 
 1947 -0.09611378 
 1948 -1.127277 
 1949 -3.16189 
 1950 -1.458734 
 1951 -0.3547352 
 1952 -0.5511304 
 1953 1.296445 
 1954 1.370348 
 1955 -0.4596552 
 1956 -1.479943 
 1957 -0.1091177 
 1958 1.312098 
 1959 -1.213043 
 1960 -0.6458656 
 1961 0.3033935 
 1962 -1.544733 
 1963 -0.6257037 
 1964 -0.7368177 
 1965 -1.319852 
 1966 -1.559213 
 1967 -0.06578135 
 1968 -0.7122603 
 1969 -1.888782 
 1970 -0.03348343 
 1971 -0.8316797 
 1972 -1.294386 
 1973 -1.268229 
 1974 -0.3321199 
 1975 -0.4965497 
 1976 1.356731 
 1977 -0.6296284 
 1978 -2.913377 
 1979 -4.529339 
 1980 0.3103899 
 1981 1.837837 
 1982 -1.730293 
 1983 1.347402 
 1984 -1.382409 
 1985 -1.949076 
 1986  0.22615 
 1987 1.713975 
 1988 -0.5860823 
 1989 -0.848977 
 1990 0.3246506 
 1991 -0.2393124 
 1992 2.563973 
 1993 -1.928938 
 1994 -0.8344963 
 1995 1.567831 
 1996 -0.1804029 
 1997 -0.9109988 
 1998 1.525306 
 1999 1.484982 
 2000 2.255475 
 2001 -1.66301 
 2002  1.27089 
 2003 0.5715961 
 2004 0.2087554 
 2005 1.218503 
 2006 1.857163 
 2007 -0.2129972 
 2008 -0.5326312 
 2009 -0.08644801 
 2010 -1.81784 
 2011 -0.9233621 
 2012 1.604699 
 2013 0.4004051 
 2014 -1.379869 
 2015 1.044889 
 2016 2.204213 
 2017 0.9392921 
 2018 -0.2004452