# year    value 
 1900 -0.4302087 
 1901 -0.5296754 
 1902 -0.5276366 
 1903 -0.7834615 
 1904 -0.7113355 
 1905 -0.5731881 
 1906 -0.5650357 
 1907 -0.5044283 
 1908 -0.5424969 
 1909 -0.4294815 
 1910 -0.4720424 
 1911 -0.423561 
 1912 -0.4253609 
 1913 -0.499146 
 1914 -0.4651923 
 1915 -0.4203035 
 1916 -0.3618073 
 1917 -0.364137 
 1918 -0.4283192 
 1919 -0.4431774 
 1920 -0.3874917 
 1921 -0.3449878 
 1922 -0.3667184 
 1923 -0.3501418 
 1924 -0.3683912 
 1925 -0.2887154 
 1926 -0.3660125 
 1927 -0.2891515 
 1928 -0.3021185 
 1929 -0.3641514 
 1930 -0.3721761 
 1931 -0.3470234 
 1932 -0.3437913 
 1933 -0.3444954 
 1934 -0.4372483 
 1935 -0.3112136 
 1936 -0.220571 
 1937 -0.268061 
 1938 -0.2541482 
 1939 -0.2240803 
 1940 -0.3007433 
 1941 -0.2865767 
 1942 -0.1944132 
 1943 -0.2286092 
 1944 -0.1764171 
 1945 -0.2119206 
 1946 -0.3139194 
 1947 -0.2662411 
 1948 -0.2307397 
 1949 -0.1281971 
 1950 -0.2394496 
 1951 -0.2193318 
 1952 -0.2108372 
 1953 -0.2838071 
 1954 -0.1928207 
 1955 -0.2872947 
 1956 -0.1886113 
 1957 -0.2168475 
 1958 -0.2423937 
 1959 -0.2103111 
 1960 -0.1848355 
 1961 -0.1539499 
 1962 -0.2116171 
 1963 -0.2805785 
 1964 -0.5670225 
 1965 -0.402299 
 1966 -0.394891 
 1967 -0.3637273 
 1968 -0.3223272 
 1969 -0.3235491 
 1970 -0.2627304 
 1971 -0.1448468 
 1972 -0.1769636 
 1973 -0.1663559 
 1974 -0.2078951 
 1975 -0.1951578 
 1976 -0.1248183 
 1977 -0.1342326 
 1978 -0.09918306 
 1979 -0.09954903 
 1980 0.02317179 
 1981 0.04473823 
 1982 -0.04260839 
 1983 -0.244884 
 1984 -0.07928593 
 1985 -0.04852897 
 1986 -0.1044111 
 1987 -0.01162035 
 1988 0.1373657 
 1989 0.1045311 
 1990 0.178644 
 1991 0.1847976 
 1992 -0.2260577 
 1993 -0.003103803 
 1994 -0.0175719 
 1995 0.00193123 
 1996 0.1582181 
 1997 0.2186051 
 1998 0.242115 
 1999 0.293698 
 2000 0.254547 
 2001 0.3847361 
 2002 0.4994726 
 2003 0.3382937 
 2004 0.3646204 
 2005 0.4771066