# year    value 
 1900 -0.2706334 
 1901 -0.2394008 
 1902 -0.311204 
 1903 -0.7533474 
 1904 -0.5609276 
 1905 -0.4925615 
 1906 -0.274414 
 1907 -0.3466723 
 1908 -0.3410994 
 1909 -0.2996248 
 1910 -0.2877652 
 1911 -0.3045759 
 1912 -0.6284918 
 1913 -0.4905175 
 1914 -0.4135351 
 1915 -0.2627205 
 1916 -0.2941765 
 1917 -0.2194002 
 1918 -0.1228647 
 1919 -0.1478548 
 1920 -0.2662542 
 1921 -0.2095836 
 1922 -0.1899746 
 1923 -0.06258213 
 1924 -0.1519381 
 1925 -0.1541609 
 1926 -0.1093719 
 1927 -0.1078971 
 1928 -0.1770381 
 1929 -0.2479298 
 1930 -0.07808684 
 1931 -0.1573261 
 1932 -0.1173487 
 1933 -0.1891831 
 1934 -0.07876115 
 1935 -0.1260854 
 1936 -0.191703 
 1937 -0.05050549 
 1938 -0.1825607 
 1939 -0.08271804 
 1940 -0.07085587 
 1941 -0.002251568 
 1942 -0.1386331 
 1943 -0.06612928 
 1944 -0.06101495 
 1945 -0.07494081 
 1946 -0.1602318 
 1947 -0.1372194 
 1948 -0.07185402 
 1949 -0.04236777 
 1950 -0.04705272 
 1951 -0.1242664 
 1952 -0.1265459 
 1953 -0.04636705 
 1954 -0.0934973 
 1955 -0.05052228 
 1956 -0.09177972 
 1957 -0.07625394 
 1958 -0.2203741 
 1959 -0.08009983 
 1960 -0.1577157 
 1961 -0.1416881 
 1962 -0.09861624 
 1963 -0.2199153 
 1964 -0.4256759 
 1965 -0.3682694 
 1966 -0.2298744 
 1967 -0.3227769 
 1968 -0.3636626 
 1969 -0.3709241 
 1970 -0.1804521 
 1971 -0.06827849 
 1972 -0.1414545 
 1973 -0.1902311 
 1974 -0.06757748 
 1975 -0.1014642 
 1976 -0.1345297 
 1977 -0.08158349 
 1978 0.01564633 
 1979 0.1266168 
 1980 0.1057272 
 1981 0.112068 
 1982 -0.01002218 
 1983 -0.2322527 
 1984 -0.0397001 
 1985 0.1079707 
 1986 0.1124405 
 1987 0.2137133 
 1988 0.3686837 
 1989 0.3091318 
 1990 0.3016905 
 1991 0.2152797 
 1992 -0.1712298 
 1993 0.07633471 
 1994 0.3349176 
 1995 0.3838442 
 1996 0.4023549 
 1997 0.5234706 
 1998 0.6334035 
 1999 0.6179003 
 2000 0.7566449 
 2001 0.8053899 
 2002 0.8232455 
 2003 0.8344796 
 2004 0.7862956 
 2005 0.8702458