Roheisen
Siberia’s contribution to the Soviet economy in percent of national output was given in Soviet statistical yearbooks for 1973 (1940 in brackets) as: Coal 33% (23%), Coking coal 30% (17%), Oil 21% (1.6%), Natural gas 8.5% (from 1.5% in 1950), Electric power output 18% (6.6%), Iron ore 6.9% (1.6%), Pig iron 9.5% (10%), Crude steel 8.3% (10%), Rolled steel 10% (9.1%). But regional breakdowns were omitted in the yearbooks from 1973, except for a few 1975 figures.