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In page Natural rubber:

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More than 28 million tons of rubber were produced in 2017, of which approximately 47% was natural. Since the bulk is synthetic, which is derived from petroleum, the price of natural rubber is determined, to a large extent, by the prevailing global price of crude oil.[1][2] Asia was the main source of natural rubber, accounting for about 90% of output in 2021.[3] The three largest producers, Thailand, Indonesia,[4] and Malaysia, together account for around 72% of all natural rubber production.[citation needed] Natural rubber is not cultivated widely in its native continent of South America because of the South American leaf blight, and other natural predators there.