factory, taking advantage of the limestone in the area. There is also agriculture with tropical fruit such as Malpighia emarginata. Tourism Tourist attractions include Okinawa Churaumi Aquarium (at one time the world's largest aquarium), Century Beach, Pineapple Park, the Orion Beer Factory and Hiji Falls. In recent years, Okinawa has become an increasingly popular destination for tourists from China and Southeast Asia. In 2018, Okinawa attracted 9,842,400 tourists, a positive growth of 4.7% from 9,396,200 in the previous year. Military bases The U.S. military bases account for 4 to 5% of the island economy. There is also a smaller contingent of Japanese military bases on the island. Several former U.S. military facilities on Okinawa have been re-developed as commercial areas, most notably the American Village in Chatan, which opened in 1998, and the Aeon Mall Okinawa Rycom in Kitanakagusuku, which opened in 2015. U.S. military in Okinawa The United States maintains American military bases in Japan as part of the U.S.-Japan alliance since 1951. Most U.S. military is in Okinawa Prefecture. In 2013, there were approximately 50,000 U.S. military personnel stationed in Japan with 40,000 dependents and 5,500 American civilians employed by the United States Department of Defense. About 26,000 U.S. military personnel are on Okinawa Island. There are 13 United States military bases on Okinawa Island. Approximately 62% of all United States bases in Japan are on Okinawa. They cover 25% of Okinawa island. The major bases are Futenma, Kadena, Hansen, Torii, Schwab, Foster, and Kinser. There are 28 U.S. military facilities on Okinawa. They are mainly concentrated in the central area. At one point, Okinawa hosted approximately 1,200 nuclear warheads. There were several nuclear weapons incidents on Okinawa and in the sea near the islands. In 2020, tests around Kadena Air Base showed severe contamination of the wells and waterways of Dakujaku River and Hija river with toxic chemicals PFAS. This affects the drinking water of 450,000 residents. PFAS was used in foam at fire fighting training sites on US facilities during the 1970s and 80s. Moving the bases The 1971 Okinawa Reversion Agreement officially ended the U.S. military occupation on Okinawa. The bases primarily exist to serve Japanese and American strategic interests but are unpopular with most local residents, despite recent efforts to move the bases out of core areas following incidents involving military personnel and resultant protests (including the 1995 Okinawa rape incident). In 2012, an