The South China Sea is an extremely significant body of water in a geopolitical sense. It is the second most used sea lane in the world, while in terms of world annual merchant fleet tonnage, over 50% passes through the Strait of Malacca, the Sunda Strait, and the Lombok Strait. Over 1.6 million m³ (10 million barrels) of crude oil a day are shipped through the Strait of Malacca, where there are regular reports of piracy, but much less frequently than before the mid-20th century.