(Bloomberg) -- Coffee futures extended their rampant rally in New York as global supply worries dominate, propelling prices to the highest in more than four decades.

Arabica beans — the variety favored for specialty brews — climbed as high as $3.1845 a pound on Wednesday, putting most-active futures at the highest since 1977 and bringing this year’s rally to almost 70%. 

A severe drought earlier this year in Brazil has fueled worries about the country’s output. That comes on top of concerns about bean supplies from Vietnam, after a key coffee belt was hit by dryness during the growing period and heavy rains arrived at the start of harvest. The countries are the two biggest global growers. 

The move is set to add to the pain facing cafes and roasters, ultimately boosting costs to consumers. Nestle SA, the world’s biggest coffee maker, said in November that it will raise prices and make packs smaller to blunt the impact of more expensive beans.

Robusta coffee futures in London have also soared this year, rising about 85%.

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