Value of U.S. merchandise trade by land, water, and air gateways from 1990 to 2008 (in billion U.S. dollars*)
Reading support:
The time series shows the value of U.S. merchandise trade by land, water, and air gateways from 1990 to 2008. In 2000, the value of U.S. total water trade was 740 billion U.S. dollars.