Oil inventories held by OECD member countries fell in May to their lowest level since 1990 as governments drew down stocks to offset the blockage of Gulf crude shipments during the West Asia conflict, the International Energy Agency (IEA) said on Wednesday (June 17, 2026).

The drawdown since the start of the conflict has reached 163 million barrels in the Organisation for Economic Cooperation and Development (OECD) club of wealthy countries, the IEA said in its monthly report.

“Despite the significant reductions in demand for crude oil and refined products, the buffers in the system continue to erode at a record pace,” the agency said.

To ease the burden from soaring oil prices due to Tehran’s effective closure of the Strait of Hormuz, the IEA organised coordinated stock releases of 400 million barrels to the global market, of which 252 million have been released as of June 12.

“The flow of emergency stocks is expected to decelerate somewhat in June and July,” the agency said, after a deal was announced this week to end the war that began on February 28 with U.S. and Israeli strikes on Iran.

But the impact of high prices will weigh heavily on demand through this year, with an expected decline of 1.1 million barrels a day compared to 2025 levels.

“We see growth rebounding to 2 mb/d in 2027, as a normalisation of trade flows, lower oil prices and an improving economic outlook contribute to the recovery,” the IEA said.