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Sales fell to 3.75 million tonnes, almost 9 per cent down on May, industry sources and government data showed.
Vessels calling specifically for refuelling in Singapore, the world's largest bunkering hub, fell to 2,940 - 7.2 per cent lower than in May and down from 3,242 in June last year, said the Maritime and Port Authority of Singapore (MPA) on Wednesday (July 13).
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He added: "Many ships resorted to bunkering in other regional ports like Zhoushan in China, where bunker prices for low-sulphur marine fuels were being offered at a discount to Singapore for most of the month."
Mr Yaw Yan Chong, a director at Refinitiv Oil Research, said the loss of gasoil exports from Russia, a key supplier to Europe, forced buyers there to seek alternative sources, sparking a demand surge that drove refining margins for the product to record highs.
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