Occidental Petroleum Corp. revenue for the last year amounted to 25.60 B EUR, the most of which — 19.28 B EUR — came from its highest performing source at the moment, Oil and Gas, the year earlier bringing 25.38 B EUR. The greatest contribution to the revenue figure was made by United States — last year it brought Occidental Petroleum Corp. 22.41 B EUR, and the year before that — 29.92 B EUR.