Maine jobs related to international exports and imports totaled 171,300, with 31 percent of them linked to trade with neighboring Canada and Mexico, a new study released Thursday found. The study, which was funded by a trade advocacy group and used the latest available data from 2017, said more than one in five jobs in the state was trade-related. Trade-supported jobs in Maine increased by 172 percent in 2017 compared with 1992, two years before the North American Free Trade Agreement was implemented.