South Korea's producer prices rose slightly in April on increasing crude oil prices.

According to data by the Bank of Korea(BOK) Monday, the producer price index -- a barometer of future consumer inflation -- came to 104-point-13 last month, up one tenth of a percent from a month earlier.

The index rose one-point-six percent year-on-year last month, marking the 18th consecutive month of gains.  

A BOK official attributed the rise to an eight-point-eight percent jump in crude oil prices last month.

Prices of agricultural products, which pushed up producer prices early this year, fell one-point-one percent in April, posing a decrease for the second consecutive month.