San Juan experienced significant economic growth following World War II. During this period the city underwent an industrial revolution, although as of 1984 it had never generated its own economic region. The city's economy relies mostly on companies dedicated to the manufacture of several products, including: Chemical substances (bleach and house cleaning products); medicines; rum and other beverages; fertilizers; electric tools; electronic devices; plastics, textiles, and food-based products. Tourism is also a key industry, based on San Juan's proximity to Puerto Rico's main airport, the Luis Muñoz Marín International Airport.