# year    value 
 1901 0.4277146 
 1902 1.562511 
 1903 0.9657062 
 1904 0.6288921 
 1905 0.4810466 
 1906 0.4751585 
 1907 1.308935 
 1908 0.8389625 
 1909 0.8841851 
 1910 1.186464 
 1911 0.5581335 
 1912 1.212947 
 1913 0.8630714 
 1914 1.807331 
 1915 0.8444335 
 1916 1.273954 
 1917 0.9078717 
 1918 0.4370624 
 1919 0.2016112 
 1920 0.7135643 
 1921 0.862628 
 1922 1.323149 
 1923 0.8814337 
 1924   1.2018 
 1925  0.32377 
 1926 1.762996 
 1927 0.5485477 
 1928 1.207852 
 1929 0.1972053 
 1930 -0.3692885 
 1931 0.3388081 
 1932 1.146877 
 1933 0.2625598 
 1934 0.9389856 
 1935 1.299364 
 1936 -0.04416938 
 1937 0.7800876 
 1938 0.7897279 
 1939  1.29452 
 1940 1.744751 
 1941 2.330198 
 1942 1.399558 
 1943 0.8335944 
 1944 1.380529 
 1945 -1.174301 
 1946 2.242508 
 1947 0.5090759 
 1948 1.169766 
 1949  1.48454 
 1950 0.4283766 
 1951 -0.3269081 
 1952 1.996474 
 1953 1.002876 
 1954 1.171418 
 1955 0.1997241 
 1956 0.9673768 
 1957 -0.3629997 
 1958 1.823169 
 1959 1.427797 
 1960 1.637694 
 1961 0.932879 
 1962 0.9364854 
 1963 1.467773 
 1964 0.1705722 
 1965 1.297097 
 1966 2.213516 
 1967 0.3836429 
 1968 -0.09354392 
 1969 0.1255993 
 1970 1.491562 
 1971 0.7424725 
 1972 0.4697634 
 1973 1.621724 
 1974 0.4430733 
 1975 0.6892191 
 1976 1.337843 
 1977 0.08927715 
 1978 0.949732 
 1979 2.392849 
 1980 1.539313 
 1981  1.87075 
 1982 1.511872 
 1983 0.9692842 
 1984 0.2367066 
 1985 0.9655463 
 1986 1.413926 
 1987 2.322404 
 1988 1.997319 
 1989 1.721751 
 1990 2.217961 
 1991 1.741331 
 1992 1.555928 
 1993 2.022435 
 1994 1.657925 
 1995 1.571162 
 1996 1.193966 
 1997 1.799685 
 1998 1.762394 
 1999 3.110332 
 2000 1.585889 
 2001  2.31858 
 2002 2.752571 
 2003  2.08495 
 2004 2.522717 
 2005 1.486696 
 2006 2.302748 
 2007 2.779989 
 2008 0.5920857 
 2009   3.0949 
 2010 2.233192 
 2011 1.389713 
 2012 0.5621831 
 2013 1.730592 
 2014  1.59335 
 2015 2.379463 
 2016 2.409189 
 2017 3.098213 
 2018   2.1053