The Dubai government's decision to diversify from a trade-based but oil-reliant economy to one that is service- and tourism-oriented has made real estate and other developments more valuable, resulting in the property boom from 2004–2006. Construction on a large scale has turned Dubai into one of the fastest-growing cities in the world. There are a number of large-scale projects which are currently under construction or will be constructed in the future. Due to the heavy construction which is taking place in Dubai, 30,000 construction cranes, which is 25% of cranes worldwide, are operating in Dubai. Due to the burst of construction, Dubai has acquired various building-related records, which include: the world's tallest tower (Burj Dubai), the world's largest shopping mall (Dubai Mall), the world's largest fountain (Dubai fountain) and the world's tallest hotel (Rose Tower). Also under construction is Dubailand, which will be almost twice the size of the Walt Disney World Resort.