Angola was the Mainland’s second-biggest oil supplier last month after its exports rose to 1.114 million barrels a day, Reuters reports.

The news agency says the year-on-year increase was about 15 percent, based on figures released by the Chinese General Administration of Customs this week.

Russia was the Mainland’s biggest supplier last month, shipping 1.15 million barrels a day, which was a 1.9-percent decrease from the same time last year.

Saudi Arabia, the Mainland’s third-ranked oil supplier, exported 963,000 barrels a day.