Pecker is a key witness in the case against the former US president, who is accused of falsifying business records to cover up hush-money payment
Food, beverage and tobacco costs - which account for almost a third of the consumer price index - jumped 23.7 per cent, the Oman Ministry of National Economy said in a monthly report on its web site.
Inflation is soaring across the world's biggest oil-exporting region, where economies that have boomed on the high price of oil are being hit by higher import costs.
Inflation, which hit 13.73 per cent in June, has been accelerating since May 2007, with the consumer price index jumping to 125.1 points on June 30, compared with 110 points a year earlier, ministry data showed.
"There always seems to be a jump around (the holy month of Ramadan), but we possibly see it coming to a peak soon," said EFG-Hermes senior economist Monica Malik.
Oman and most of its neighbours, including Saudi Arabia, peg their currencies to the US dollar, which is driving up import costs.
Currency weakness is only part of the problem, as countries across the world suffer from high global commodity prices. Oil has been as high as $147 a barrel this year, although it has retreated to about $116 a barrel, still almost double this time last year.
Rents, which account for just over 15 per cent of Oman's index, eased to 14 per cent in June from 16.6 per cent in May, the data showed.
"It's encouraging to see house prices stabilising," Malik said.
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