1901 -0.4076
 1902 -0.3543
 1903 -0.2363
 1904 -0.0093
 1905  0.3955
 1906  0.8202
 1907  1.0363
 1908  0.9421
 1909  0.4789
 1910 -0.2724
 1911 -1.1028
 1912 -1.7211
 1913 -1.6405
 1914 -0.7109
 1915  0.4873
 1916  1.3265
 1917  1.6276
 1918  1.3997
 1919  0.6596
 1920 -0.3148
 1921 -0.9750
 1922 -1.1428
 1923 -1.0825
 1924 -0.9528
 1925 -0.6831
 1926 -0.2446
 1927  0.1948
 1928  0.4975
 1929  0.7121
 1930  0.9248
 1931  1.0320
 1932  0.7262
 1933 -0.0221
 1934 -0.6848
 1935 -0.7939
 1936 -0.5659
 1937 -0.4091
 1938 -0.3304
 1939 -0.1415
 1940  0.2537
 1941  0.7463
 1942  1.0671
 1943  1.0213
 1944  0.6912
 1945  0.1649
 1946 -0.5538
 1947 -1.1947
 1948 -1.4942
 1949 -1.4020
 1950 -0.8437
 1951 -0.0404
 1952  0.5601
 1953  0.8768
 1954  1.0978
 1955  1.2053
 1956  1.0111
 1957  0.6444
 1958  0.2135
 1959 -0.3445
 1960 -0.8050
 1961 -1.0436
 1962 -1.1339
 1963 -0.9700
 1964 -0.4215
 1965  0.3663
 1966  1.0810
 1967  1.4567
 1968  1.5036
 1969  1.3436
 1970  0.7324
 1971 -0.4915
 1972 -1.8585
 1973 -2.6883
 1974 -2.6091
 1975 -1.7062
 1976 -0.4589
 1977  0.7127
 1978  1.6403
 1979  2.2211
 1980  2.4113
 1981  2.0828
 1982  1.1720
 1983 -0.0840
 1984 -1.2680
 1985 -1.8839
 1986 -1.7068
 1987 -1.0421
 1988 -0.4109
 1989 -0.0298
 1990  0.1330
 1991  0.1579
 1992  0.0562
 1993 -0.1717
 1994 -0.1931
 1995  0.1792
 1996  0.6553
 1997  0.8445
 1998  0.5497
 1999  0.0056
 2000 -0.4173
 2001 -0.6523
 2002 -0.6965
 2003 -0.3570
 2004  0.3214
 2005  0.8589
 2006  0.8980
 2007  0.5089
 2008 -0.0051
 2009 -0.2753
 2010 -0.2587
 2011 -0.2584