# year    value 
 1900 -0.1854758 
 1901 -0.05742659 
 1902 -0.06491262 
 1903 -0.5266093 
 1904 -0.3030611 
 1905 -0.4038804 
 1906 -0.1863541 
 1907 -0.36083 
 1908 -0.03660381 
 1909 0.04433376 
 1910 0.01661936 
 1911 -0.1762838 
 1912 -0.5387153 
 1913 -0.2913277 
 1914 -0.05984074 
 1915 -0.09433505 
 1916 -0.09591115 
 1917 0.2922803 
 1918 0.2631324 
 1919 -0.1494161 
 1920 -0.1730582 
 1921 -0.1977845 
 1922 -0.02007668 
 1923 -0.0833893 
 1924 0.1294426 
 1925 0.08947377 
 1926 0.005965958 
 1927 0.1400207 
 1928 -0.09480162 
 1929 -0.15131 
 1930 0.1537534 
 1931 0.1013342 
 1932 0.06995484 
 1933 0.08422668 
 1934 0.08323428 
 1935 0.07719316 
 1936 0.02673058 
 1937 0.179026 
 1938 -0.1220043 
 1939 0.1219197 
 1940 0.1439624 
 1941 0.1498029 
 1942 -0.1354899 
 1943 0.1056527 
 1944 0.2046667 
 1945 0.1156529 
 1946 0.02278943 
 1947 -0.05430114 
 1948 0.004203657 
 1949 0.1482146 
 1950 0.1666422 
 1951 0.0739871 
 1952 -0.0003710166 
 1953 0.3146126 
 1954 0.214607 
 1955 0.1290345 
 1956 -0.02186039 
 1957 0.139678 
 1958 -0.04600299 
 1959 -0.1629538 
 1960 0.1221427 
 1961 0.02099133 
 1962 0.1902605 
 1963 -0.07395031 
 1964 -0.3149929 
 1965 -0.2970211 
 1966 -0.1620652 
 1967 -0.07911817 
 1968 -0.1660988 
 1969 -0.3753503 
 1970 -0.02085781 
 1971 0.1153551 
 1972 0.1602227 
 1973 -0.06509333 
 1974 0.2344445 
 1975 0.09237936 
 1976 0.0735417 
 1977 -0.03214349 
 1978 0.03004822 
 1979 0.3021279 
 1980 0.2200996 
 1981 0.2863375 
 1982 -0.0180684 
 1983 -0.1614689 
 1984 0.1115897 
 1985 0.3445026 
 1986 0.3357113 
 1987 0.437246 
 1988 0.5222286 
 1989 0.5049768 
 1990 0.2807347 
 1991 0.193168 
 1992 -0.2660476 
 1993 0.2954403 
 1994 0.6023982 
 1995 0.4886902 
 1996 0.4031049 
 1997 0.8336032 
 1998 0.7173536 
 1999 0.7091701 
 2000 0.9766945 
 2001 0.8291877 
 2002 1.005229 
 2003 1.007557 
 2004 0.9670871 
 2005 0.8011082