# year    value 
 1900 -0.322006 
 1901 -0.4151451 
 1902 -0.4370579 
 1903 -0.831696 
 1904 -0.4995728 
 1905 -0.5737725 
 1906 -0.4172927 
 1907 -0.3438838 
 1908 -0.4248714 
 1909 -0.3603397 
 1910 -0.3709075 
 1911 -0.3471534 
 1912 -0.6027778 
 1913 -0.4791371 
 1914 -0.4521893 
 1915 -0.3577752 
 1916 -0.27247 
 1917 -0.264121 
 1918 -0.2354157 
 1919 -0.1493354 
 1920 -0.1671832 
 1921 -0.2899472 
 1922 -0.2056166 
 1923 -0.1981535 
 1924 -0.235076 
 1925 -0.2778717 
 1926 -0.1242337 
 1927 -0.2083285 
 1928 -0.2404747 
 1929 -0.3343807 
 1930 -0.2048299 
 1931 -0.2445951 
 1932 -0.3014553 
 1933 -0.2072641 
 1934 -0.2358358 
 1935 -0.2086407 
 1936 -0.1824827 
 1937 -0.1665489 
 1938 -0.2332427 
 1939 -0.07224374 
 1940 -0.1817917 
 1941 -0.1932427 
 1942 -0.1617736 
 1943 -0.2090827 
 1944 -0.1400951 
 1945 -0.2514692 
 1946 -0.1559783 
 1947 -0.1191085 
 1948 -0.1463293 
 1949 -0.1279555 
 1950 -0.09023544 
 1951 -0.1485723 
 1952 -0.1758738 
 1953 -0.259136 
 1954 -0.2625434 
 1955 -0.1677703 
 1956 -0.08967832 
 1957 -0.1498779 
 1958 -0.2263591 
 1959 -0.1511932 
 1960 -0.2130388 
 1961 -0.261767 
 1962 -0.2558072 
 1963 -0.4411025 
 1964 -0.5654838 
 1965 -0.3952179 
 1966 -0.3693496 
 1967 -0.4604533 
 1968 -0.443439 
 1969 -0.3783588 
 1970 -0.3256514 
 1971 -0.1039015 
 1972 -0.2774719 
 1973 -0.1655259 
 1974 -0.1309193 
 1975 -0.2150051 
 1976 -0.2921427 
 1977 -0.1100776 
 1978 -0.1359411 
 1979 0.05020559 
 1980 -0.03723442 
 1981 0.04683753 
 1982 -0.2832395 
 1983 -0.3075193 
 1984 -0.1642056 
 1985 -0.03769947 
 1986 0.02925587 
 1987 0.1305452 
 1988 0.1691437 
 1989 0.2251772 
 1990 0.1669994 
 1991 -0.03892286 
 1992 -0.2212723 
 1993 0.009155591 
 1994 0.1604931 
 1995 0.1450291 
 1996 0.3307067 
 1997 0.2761576 
 1998 0.4193138 
 1999 0.4523845 
 2000 0.4666182 
 2001 0.6446819 
 2002 0.5660317 
 2003 0.576627 
 2004 0.6196644 
 2005 0.6927826