# year value 1900 -11.96654 1901 -11.95324 1902 -11.84044 1903 -12.29493 1904 -12.2817 1905 -12.10939 1906 -12.07032 1907 -11.91207 1908 -11.9658 1909 -12.03157 1910 -11.95372 1911 -11.73622 1912 -11.77671 1913 -12.09773 1914 -12.08169 1915 -11.97635 1916 -11.75322 1917 -11.7558 1918 -11.90788 1919 -11.98096 1920 -11.8096 1921 -11.90734 1922 -11.87431 1923 -11.77158 1924 -11.74465 1925 -11.758 1926 -11.62209 1927 -11.75876 1928 -11.69413 1929 -11.86515 1930 -11.84285 1931 -11.66524 1932 -11.9754 1933 -11.77859 1934 -11.65554 1935 -11.79494 1936 -11.66504 1937 -11.77624 1938 -11.67585 1939 -11.74781 1940 -11.72163 1941 -11.78722 1942 -11.67083 1943 -11.58681 1944 -11.65224 1945 -11.63112 1946 -11.71459 1947 -11.5664 1948 -11.67761 1949 -11.82323 1950 -11.63334 1951 -11.78081 1952 -11.85307 1953 -11.53203 1954 -11.7307 1955 -11.48933 1956 -11.73069 1957 -11.71145 1958 -11.77559 1959 -11.73541 1960 -11.80611 1961 -11.6846 1962 -11.62489 1963 -11.60617 1964 -11.94041 1965 -11.96889 1966 -11.81422 1967 -11.92398 1968 -11.85403 1969 -12.08879 1970 -11.89566 1971 -11.76283 1972 -11.67727 1973 -11.72954 1974 -11.50438 1975 -11.72947 1976 -11.70025 1977 -11.62157 1978 -11.64405 1979 -11.64059 1980 -11.56629 1981 -11.41651 1982 -11.4052 1983 -12.02194 1984 -11.56712 1985 -11.66113 1986 -11.49099 1987 -11.50561 1988 -11.32936 1989 -11.49242 1990 -11.26077 1991 -11.13133 1992 -11.69667 1993 -11.65588 1994 -11.65228 1995 -11.20095 1996 -11.06195 1997 -11.24192 1998 -11.28696 1999 -11.23985 2000 -10.86202 2001 -10.94562 2002 -10.8854 2003 -10.81022 2004 -10.89925 2005 -10.90751