  Year  SsfStb
  1856   1.038
  1857   1.067
  1858   1.012
  1859   0.988
  1860   0.783
  1861   0.932
  1862   1.040
  1863   0.859
  1864   1.118
  1865   0.970
  1866   0.941
  1867   0.860
  1868   1.110
  1869   1.003
  1870   1.020
  1871   1.044
  1872   1.025
  1873   1.101
  1874   1.056
  1875   0.816
  1876   1.075
  1877   1.025
  1878   0.772
  1879   0.953
  1880   0.982
  1881   1.098
  1882   1.008
  1883   0.983
  1884   1.207
  1885   1.080
  1886   0.871
  1887   0.844
  1888   0.948
  1889   0.775
  1890   0.759
  1891   1.116
  1892   0.848
  1893   1.139
  1894   1.059
  1895   1.120
  1896   1.134
  1897   0.957
  1898   0.992
  1899   0.926
  1900   0.948
  1901   0.952
  1902   1.045
  1903   0.780
  1904   1.164
  1905   1.159
  1906   0.904
  1907   0.797
  1908   0.855
  1909   0.887
  1910   0.885
  1911   1.152
  1912   0.927
  1913   1.217
  1914   1.039
  1915   0.764
  1916   0.660
  1917   1.095
  1918   1.206
  1919   1.370
  1920   1.069
  1921   1.138
  1922   1.007
  1923   0.939
  1924   1.051
  1925   1.018
  1926   0.884
  1927   1.061
  1928   0.739
  1929   0.947
  1930   1.007
  1931   1.122
  1932   0.963
  1933   1.065
  1934   0.908
  1935   0.812
  1936   1.062
  1937   0.942
  1938   1.026
  1939   0.987
  1940   1.302
  1941   0.968
  1942   1.112
  1943   0.893
  1944   1.096
  1945   0.905
  1946   0.799
  1947   0.969
  1948   0.799
  1949   1.084
  1950   0.812
  1951   1.196
  1952   1.015
  1953   0.973
  1954   1.020
  1955   0.967
  1956   0.946
  1957   1.174
  1958   1.000
  1959   1.140
  1960   0.851
  1961   1.162
  1962   0.917
  1963   1.378
  1964   1.008
  1965   1.060
  1966   0.914
  1967   1.022
  1968   0.841
  1969   0.876
  1970   0.693
  1971   0.929
  1972   0.882
  1973   0.773
  1974   0.895
  1975   0.900
  1976   1.153
  1977   1.097
  1978   1.017
  1979   0.910
  1980   0.950
  1981   0.999
  1982   1.151
  1983   0.982
  1984   0.985
  1985   1.001
  1986   1.150
  1987   1.000
  1988   0.948
  1989   0.999
  1990   1.084
  1991   1.204
  1992   1.231
  1993   1.125
  1994   1.064
  1995   0.792
  1996   0.985
  1997   0.970
  1998   0.900
  1999   1.132
  2000   1.157
  2001   1.116
  2002   1.177
