Query: How many tons of cargo arrived in PortMiami in 2007?
Context: In 2007, the port served 3,787,410 passengers. Additionally, the port is one of the nation's busiest cargo ports, importing 7.8 million tons of cargo in 2007. Among North American ports, it ranks second only to the Port of South Louisiana in New Orleans in terms of cargo tonnage imported/exported from Latin America.