30 countries on five continents. Arab Bank represents 28% of the Amman Stock Exchange and is the highest-ranked institution by market capitalization on the exchange. Tourism Amman is the 4th most visited Arab city and the ninth highest recipient of international visitor spending. Roughly 1.8 million tourists visited Amman in 2011 and spent over $1.3 billion in the city. The expansion of Queen Alia International Airport is an example of the Greater Amman Municipality's heavy investment in the city's infrastructure. The recent construction of a public transportation system and a national railway, and the expansion of roads, are intended to ease the traffic generated by the millions of annual visitors to the city. Amman, and Jordan in general, is the Middle East's hub for medical tourism. Jordan receives the most medical tourists in the region and the fifth highest in the world. Amman receives 250,000 foreign patients a year and over $1 billion annually. Business Amman is introducing itself as a business hub. The city's skyline is being continuously transformed through the emergence of new projects. A significant portion of business flowed into Amman following the 2003 Iraq War. Jordan's main airport, Queen Alia International Airport, is located south of Amman and is the hub for the country's national carrier Royal Jordanian, a major airline in the region. The airline is headquartered in Zahran district. Rubicon Group Holding and Maktoob, two major regional information technology companies, are based in Amman, along with major international corporations such as Hikma Pharmaceuticals, one of the Middle East's largest pharmaceutical companies, and Aramex, the Middle East's largest logistics and transportation company. In a report by Dunia Frontier Consultants, Amman, along with Doha, Qatar and Dubai, United Arab Emirates, are the favored hubs for multinational corporations operating in the Middle East and North Africa region. In FDI magazine, Amman was chosen as the Middle Eastern city with the most potential to be a leader in foreign direct investment in the region. Furthermore, several of the world's largest investment banks have offices in Amman including Standard Chartered, Société Générale, and Citibank. Demographics The population of Amman reached 4,007,526 in 2015; the city contains about 42% of Jordan's entire population. It has a land area of which yields a population density of about . The population of Amman has risen exponentially with the successive waves of immigrants and refugees arriving throughout the 20th century. From a population