International trade is a huge industry in the Bayou City. Trade between Houston companies and their worldwide trade partners was valued at $192.2 billion in 2017, according to a May 2018 report from the Greater Houston Partnership. Houston’s two international airports, a spaceport and the Port of Houston — the busiest port in the state of Texas and the 16th busiest port in the world by tonnage — all contribute to Houston’s trade activity. Here are the five countries doing the most business with...