Year    H.Coal    B.Coal       Oil    Smelting   Total
                kt/a      kt/a      kt/a      kt/a      kt/a

      1929         0         0         0      4.08      4.08
      1930         0         0         0      6.57      6.57
      1931         0         0         0      9.11      9.11
      1932         0         0         0      13.3      13.3
      1933         0         0         0      14.7      14.7
      1934         0         0         0      17.5      17.5
      1935         0         0         0      4.68      4.68