One of the locks that enter Gatun Lake from the Atlantic Ocean at the Panama Canal in Panama on Oct. 26, 2012. Grain exports represent 17 percent of the total cargo that flows through the Panama Canal and 90 percent of those grains are from the U.S. Under the U.S.-Panama Trade Promotion Agreement (Panama TPA), which entered into force Oct. 31, U.S. grains and other agricultural products exported to Panama will be completely duty-free within 15 years.
