Read this: Lying in the western Pacific, Guam is a popular destination for Japanese tourists. Its tourist hub, Tumon, features over 20 large hotels, a Duty Free Shoppers Galleria, Pleasure Island district, indoor aquarium, Sandcastle Las Vegas–styled shows and other shopping and entertainment venues. It is a relatively short flight from Asia or Australia compared to Hawaii, with hotels and seven public golf courses accommodating over a million tourists per year. Although 75% of the tourists are Japanese, Guam receives a sizable number of tourists from South Korea, the U.S., the Philippines, and Taiwan. Significant sources of revenue include duty-free designer shopping outlets, and the American-style malls: Micronesia Mall, Guam Premier Outlets, the Agana Shopping Center, and the world's largest Kmart.[citation needed]

How many retail stores are there in Agana Shopping Center?
What is the answer? (If it cannot be answered, return "unanswerable")
unanswerable