The NIOC is exclusively responsible for the exploration, drilling, production, distribution and export of crude oil, as well as exploration, extraction and sales of natural gas and liquefied natural gas (LNG). NIOC exports its surplus production according to commercial considerations determined by the Organization of Petroleum Exporting Countries (OPEC) and at the prices prevalent in the international markets. In early 2015 NIOC's recoverable liquid hydrocarbon reserves was (10% of world's total) and recoverable gas reserves were 33.79 m3 (15% of world's total). Current NIOC production capacities include over of crude oil and in excess of 750 million cubic meters of natural gas per day. Iran's overall export crude oil was valued at US$85 billion in 2010.