1880 0.172736
1881 0.126771
1882 -0.240894
1883 -0.88591
1884 -1.12679
1885 -1.01586
1886 -0.439
1887 -0.117281
1888 -0.0824218
1889 -0.226631
1890 -0.331227
1891 -0.277351
1892 -0.0443868
1893 0.188577
1894 0.242473
1895 0.179069
1896 0.0950874
1897 0.0776484
1898 0.117262
1899 0.206016
1900 0.237719
1901 0.0459462
1902 -0.391456
1903 -0.518226
1904 -0.38035
1905 0.0459462
1906 0.218701
1907 0.25356
1908 0.270999
1909 0.309034
1910 0.264647
1911 0.109351
1912 -0.0206149
1913 0.0110872
1914 0.148964
1915 0.309034
1916 0.359735
1917 0.4057
1918 0.393015
1919 0.394613
1920 0.340717
1921 0.35498
1922 0.339139
1923 0.361332
1924 0.375595
1925 0.39777
1926 0.402524
1927 0.391437
1928 0.334384
1929 0.369243
1930 0.366087
1931 0.364489
1932 0.3217
1933 0.339139
1934 0.377174
1935 0.457998
1936 0.500787
1937 0.537244
1938 0.537244
1939 0.50712
1940 0.521383
1941 0.4897
1942 0.472261
1943 0.483348
1944 0.518226
1945 0.55784
1946 0.580033
1947 0.614892
1948 0.595875
1949 0.540401
1950 0.524559
1951 0.500787
1952 0.524559
1953 0.537244
1954 0.606962
1955 0.664014
1956 0.689384
1957 0.681453
1958 0.63391
1959 0.651349
1960 0.629155
1961 0.529314
1962 0.155297
1963 -0.110948
1964 -0.188596
1965 0.038035
1966 0.339139
1967 0.475437
1968 0.480191
1969 0.51505
1970 0.597453
1971 0.763856
1972 0.820909
1973 0.81933
1974 0.738506
1975 0.762278
1976 0.806645
1977 0.957207
1978 1.05072
1979 1.12994
1980 1.1347
1981 0.866874
1982 0.63391
1983 0.562594
1984 0.784471
1985 1.12203
1986 1.3027
1987 1.39461
1988 1.44373
1989 1.41363
1990 1.02535
1991 0.586366
1992 0.499209
1993 0.784471
1994 1.32012
1995 1.60856
1996 1.72899
1997 1.77654
1998 1.82726
1999 1.91284
2000 1.97622
2001 2.01901
2002 2.0111
2003 2.0111
2004 2.0412
2005 2.03803
2006 2.07924
2007 2.04596
2008 2.06973
2009 2.10934
2010 2.1664