South Korea's producer prices, a key barometer of future inflation, rose last year by the most in a decade.
The Bank of Korea says the average producer price index last year came to 109.6, up 6.4 percent from a year earlier.
And the index itself hit an all-time high.
The central bank attributes the rise to global supply bottlenecks and a rise in the prices of oil and other raw materials.
But in December, it said the rise in the index was almost unchanged from the month before as oil prices came down.