1880 0.0
1881 0.0
1882 0.0
1883 0.0
1884 0.0
1885 0.0
1886 0.0
1887 0.0
1888 0.0
1889 0.0
1890 0.0
1891 0.0
1892 0.0
1893 0.0
1894 0.0
1895 0.0
1896 0.0
1897 0.0
1898 0.0
1899 0.0
1900  0.454
1901 -0.129
1902  0.767
1903  0.163
1904 -0.253
1905  0.642
1906  0.486
1907  0.118
1908  0.378
1909 -0.117
1910 -0.076
1911 -0.157
1912  0.152
1913  0.574
1914  0.160
1915  0.177
1916 -0.509
1917 -0.425
1918 -0.136
1919 -0.101
1920 -0.907
1921 -0.098
1922 -0.197
1923  0.482
1924  0.137
1925  0.191
1926  1.160
1927  0.141
1928  0.156
1929  0.401
1930 -0.104
1931  0.738
1932 -0.021
1933 -0.680
1934  1.183
1935  0.798
1936  1.731
1937  0.324
1938  0.155
1939  0.065
1940  1.769
1941  1.994
1942  0.466
1943  0.114
1944 -0.127
1945 -0.190
1946 -0.583
1947  0.500
1948 -0.874
1949 -1.228
1950 -1.810
1951 -0.769
1952 -0.866
1953 -0.157
1954 -0.291
1955 -1.948
1956 -1.804
1957  0.228
1958  0.643
1959 -0.027
1960  0.058
1961 -0.818
1962 -1.158
1963 -0.686
1964 -0.770
1965 -0.314
1966 -0.459
1967 -0.734
1968 -0.403
1969 -0.098
1970 -0.398
1971 -1.291
1972 -0.922
1973 -0.804
1974 -0.337
1975 -1.102
1976  0.008
1977  0.231
1978  0.236
1979  0.335
1980  0.603
1981  0.918
1982  0.114
1983  1.648
1984  0.838
1985  0.449
1986  1.239
1987  1.821
1988  0.532
1989 -0.179
1990 -0.356
1991 -0.419
1992  0.928
1993  1.417
1994 -0.152
1995  0.642
1996  0.641
1997  1.461
1998  0.246
1999 -1.063
2000 -0.590
2001 -0.562
2002  0.221
2003  0.969
2004  0.345
2005  0.375
2006  0.191
2007 -0.196
2008 -1.292
2009 -0.613
2010 -0.312
2011 -1.231
2012 -1.100
2013 -0.517
2014 -999.900