"Compared to December, the index was affected the most by price increases in the manufacture of food products, electrical equipment, metal products, fuel oils and chemicals," Eveli Sokman, the leading analyst at SE, said.

On a month-on-month basis, producer prices rose 2.4% in January.

Import prices increased 1.2% monthly in January and gained 25.4% from a year ago.

Export prices rose 2.5% monthly in January and increased 22.1% yearly.