OCCIDENTAL PETROLEUM revenue for the last year amounted to 25.82 B EUR, the most of which — 20.97 B EUR — came from its highest performing source at the moment, Oil and Gas, the year earlier bringing 19.28 B EUR. The greatest contribution to the revenue figure was made by United States — last year it brought OCCIDENTAL PETROLEUM 23.07 B EUR, and the year before that — 22.41 B EUR.