The growth rate went up 0.4 percentage points from the previous month, while the country's daily average output of crude oil remained flat at 524,000 tonnes.
In the first five months of the year, China's crude oil output totaled 79.29 million tonnes, up 0.7 percent from a year ago, the NBS data showed.
Imports of crude oil rose 3 percent year on year to 40.23 million tonnes in May, while during the January-May period the imports totaled 205.13 million tonnes, a 7.7-percent increase from a year ago.
International oil prices declined during the period, with the benchmark Brent crude selling for 66.8 U.S. dollars per barrel on May 31, down 5.4 dollars from April 30.
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