Many of the maquiladoras are located in the Otay Mesa and Florido sections of Tijuana. The maquiladoras employed approximately 16,000 workers in 1991; another nine firms opened in 1992. Manufacturing assembly plants ("maquiladoras") were introduced in Honduras in 1976. Company unions are also prevalent among the "maquiladoras" in Guatemala. Many women work in maquiladoras, or export-based manufacturing operations. The loss of power caused 40 maquiladoras to suspend their activities, stopping 16,000 workers. Maquiladoras, or manufacturing plants, employ a large percentage of the population. The Dallas Fed also focused on research dealing with maquiladoras and other U.S.-Mexico border economics. In some maquiladoras, workers are cut and their responsibilities are given to a single worker. As of 2006, maquiladoras still accounted for 45 percent of Mexico's exports. Despite the decline of maquiladoras, exports from them have risen 40%. Since 1973, maquiladoras have also accounted for nearly half of Mexico's export assembly. Industry employs approximately 2,000 individuals, primarily at the various maquiladoras. Most maquiladoras are run by US companies, followed by Mexican, South Korean, and Japanese companies. Today, most of the maquiladoras produce electronics, automobile, and aerospace components.