Accounting for both imports and exports of merchandise, trade is more than 50% of global GDP. The top twenty countries account for 70% of international trade with eight Asian countries accounting for 30% and seven European countries accounting for 22%. The North American countries of the United States, Canada, and Mexico account for 13% exports. Invariably the top three trading partners, based on country and region, tend to be China, the European Union, and the United States. With China being the largest export nation, it helps in explaining why eight of the top twenty busiest ports are in China alone.
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