It said that between October and December its ships carried 2.05m people, down nearly 5% year-on-year.
Passenger vehicles decreased by almost 2% to 244,000, while trucks and trailers decreased more than 1% to 77,800 units.
December passenger volumes fell more than 6% to 682,000. Passenger vehicles dropped nearly 2% to 81,000, but the number of trucks and trailers carried rose by almost 3% to 23,000.
