Paris for 31 percent of the GDP of France. According to the Economist Intelligence Unit Worldwide Cost of Living Survey in 2018, Paris was the second-most expensive city in the world, behind Singapore and ahead of Zurich, Hong Kong, Oslo and Geneva. The city is a major rail, highway, and air-transport hub served by two international airports: Paris-Charles de Gaulle (the second busiest airport in Europe after London Heathrow Airport with 69.5 million passengers in 2017) and Paris-Orly. Opened in 1900, the city's subway system, the Paris Métro, serves 5.23 million passengers daily, and is the second busiest metro system in
HAL Airport October 2005 with flights to London and Paris, respectively. During the 2000s, commercial traffic to HAL Airport was rising at a rate of roughly 35% per year. Between 2006 and 2007 the airport received 8.2 million passengers, well above its capacity of 3.6 million. Because of this, in July 2004 the Government of India permitted the construction of another airport for Bangalore after a Concession Agreement with Bangalore International Airport Limited (BIAL, the company that operates the Airport), situated 30 km (19 mi) from the city in Devanahalli. The new airport, named Kempegowda International Airport, Bengaluru (KIAB), opened on 24