The economy of the United Arab Emirates (or UAE) is the 5th largest in the Middle East (after Iran, Saudi Arabia, Turkey, and Israel), with a gross domestic product (GDP) of US$503 billion (AED 1.84 trillion) in 2022. The UAE economy is heavily reliant on revenues from petroleum and natural gas, especially in Abu Dhabi. In 2009, more than 85% of the UAE's economy was based on the oil exports. In 2011, oil exports accounted for 77% of the UAE's state budget. In recent years, there has been some economic diversification, particularly in Dubai. Abu Dhabi and other UAE emirates have remained relatively conservative in their approach to diversification. Dubai has far smaller oil reserves than its counterparts. Tourism is one of the bigger non-oil sources of revenue in the UAE. A massive construction boom, an expanding manufacturing base, and a thriving services sector are helping the UAE diversify its economy. Nationwide, there is currently $350 billion worth of active construction projects. The UAE is a member of the World Trade Organization and OPEC. Economic overview UAE has the second-largest economy in the Arab world (after Saudi Arabia), with a gross domestic product (GDP) of US$414 billion (AED 1.52 trillion) in 2018. A third of the GDP is from oil revenues. The economy was expected to grow 4–4.5% in 2013, compared to 2.3–3.5% over the previous five years. Since independence in 1971, UAE's economy has grown by nearly 231 times to AED1.45 trillion in 2013. The non-oil trade has grown to AED1.2 trillion, a growth of around 28 times from 1981 to 2012. The UAE's economy is one of the most open worldwide, and its economic history goes back to the times when ships sailed to India, along the Swahili coast, as far south as Mozambique. International Monetary Fund (IMF) expected UAE's economic growth to increase to 4.5% in 2015, compared to 4.3% in 2014. The IMF ascribed UAE's potentially strong economic growth in World Economic Outlook Report to the increased contribution of non-petroleum sectors, which registered a growth average of more than 6% in 2014 and 2015. Such contribution includes banking, tourism, commerce and real estate. Increase of Emirati purchasing power and governmental expenditures in infrastructure projects have considerably increased. Internationally, UAE is ranked among the top 20 for global service business, according to AT Kearney, the top 30 on the WEF "most-networked countries" and in the top quarter