New York (CNN Business)Another key inflation indicator flashed a warning sign in May: Producer prices jumped a record amount last month.

The economy is reopening fully and soaring demand, together with supply chain issues and materials shortages, is pushing prices higher. That trend, which has been taking place all year, continued in May.

Between May 2020 and May 2021, prices increased 6.6% -- the biggest jump recorded since the Bureau of Labor Statistics started collecting this data in November 2010.

Stripping out more volatile prices for food, energy and trade services, prices rose 5.3% in the 12 months ended May. That was also the biggest jump on record, though that data series started in August 2014.

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