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 to 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 are 25% of cranes worldwide, are operating in Dubai.