Coffee bean exports from Ivory Coast's south-western port of San Pedro totalled 3,276 tonnes from October to December, down nearly 34 percent from the same 2002 period, port data showed on Thursday.
A civil war, which began in September 2002, has disrupted coffee exports because of insecurity in western growing regions.
The conflict in Africa's biggest robusta coffee producer has also heightened ethnic tensions in the western areas, and many farmers have fled their plantations.
French military officials said on Tuesday that six people were killed in the latest ethnic clashes in the region.