BEIJING (Xinhua) -- Overseas equity of oil and gas production of China National Petroleum Corporation (CNPC) rose 10% year over year in the first-quarter 2019.

Production came in at 26.09 million metric tonnes of oil equivalent in first quarter, according to the international branch of CNPC, the country's largest oil and gas producer and supplier.

The stable growth of oil and gas output is due to efforts made in enhancing quality, lowering cost and increasing efficiency, CNPC said.

The listed firm has announced to focus on high-quality development of its overseas oil and gas operations, and reach its annual targets.

The state-owned oil firm started overseas production in 1993.