Lisbon is recognised as a global city because of its importance in finance, commerce, media, entertainment, arts, international trade, education, and tourism. It is one of the major economic centres on the continent, with a growing financial sector and the largest/second largest container port on Europe's Atlantic coast. Lisbon Portela Airport serves over 15.3 million passengers annually (2012); the motorway network and the high-speed rail system of (Alfa Pendular) link the main cities of Portugal.The city is the seventh-most-visited city in Southern Europe, after Istanbul, Rome, Barcelona, Madrid, Athens, and Milan, with 1,740,000 tourists in 2009. The Lisbon region is the wealthiest region in Portugal, GDP PPP per capita is 26,100 euros (4.7% higher than the average European Union's GDP PPP per capita). It is the tenth richest metropolitan area by GDP on the continent amounting to 110 billion euros and thus €39,375 per capita, 40% higher than the average European Union's GDP per capita. The city occupies 32nd place of highest gross earnings in the world. Most of the headquarters of multinationals in the country are located in the Lisbon area and it is the ninth city in the world in terms of quantity of international conferences. It is also the political centre of the country, as seat of Government and residence of the Head of State. The seat of the district of Lisbon and the centre of the Lisbon region.