Tourism is an important part of the Dubai government's strategy to maintain the flow of foreign cash into the emirate. Dubai's lure for tourists is based mainly on shopping, but also on its possession of other ancient and modern attractions. As of 2013, Dubai was the 7th most visited city of the world based on air traffic and the fastest growing, increasing by a 10.7% rate. Dubai is expected to accommodate over 15 million tourists by 2015. The emirate is also the most populous of the seven emirates of the United Arab Emirates.