The Baltic Dry Index, a measure of shipping costs for commodities, has dropped for a fifth consecutive week as easing port congestion and fleet expansion pressured rates to hire capesize class ships, according to businesstimes.com.

The index tracking transport costs on international trade slid 0.2% this week to 2,415 points, for a 28% decline in five weeks.

Rates to hire capesize class vessels also dropped 8.5% this week to $34,647 a day.

Such vessels typically haul coal and iron ore. China is the world’s biggest user of iron ore, the largest dry-bulk commodity hauled at sea.