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
Paris–Le Havre railway journey which nobody makes.' Paris–Le Havre railway The Paris–Le Havre railway (Ligne Paris–Le Havre) is an important 228-kilometre long railway line, that connects Paris to the northwestern port city Le Havre via Rouen. Among the first railway lines in France, the section from Paris to Rouen opened on 9 May 1843, followed by the section from Rouen to Le Havre that opened on 22 March 1847. The Paris–Le Havre line leaves the Gare Saint-Lazare in Paris in northwestern direction. It crosses the river Seine at Asnières-sur-Seine, and again at Houilles. After Poissy it follows the left bank of the Seine.