Florida's economy relies heavily on tourism. About 60 million visitors visit the state every year. Warm weather and hundreds of miles of beach attract vacationers from around the world. The Walt Disney World Resort—with four theme parks and more than twenty hotels, plus countless water parks, shopping centers, and other facilities—located in Lake Buena Vista, drives the economy of Central Florida, along with more recent entries into the theme-park arena, such as the Universal Orlando Resort. Sales- and tourist-tax revenue allows the state to remain one of the few not to levy a personal income tax. Other major industries include citrus fruit and juice production, banking, and phosphate mining within the Bone Valley region. With the arrival of the space program at Kennedy Space Center in the 1960s, Florida has attracted a large number of aerospace and military industries. The state did not have any state minimum wage laws until November 2, 2004, when voters passed a constitutional amendment establishing one and mandating that it be adjusted for inflation every six months.