Paris received 38 million visitors in 2019, measured by hotel stays, with the largest numbers of foreign visitors coming from the United States, the United Kingdom, Germany and China. It was ranked as the second most visited travel destination in the world in 2019, after Bangkok and just ahead of London. The football club Paris Saint-Germain and the rugby union club Stade François are based in Paris. The 80,000-seat Stade de France, built for the 1998 FIFA World Cup, is located just north of Paris in the neighboring commune of Saint-Denis. Paris hosts the annual French Open Grand Slam tennis tournament on the red clay of Roland Garros. The city hosted the Olympic Games in 1900, 1924 and will host the 2024 Summer Olympics. The 1938 and 1998 FIFA World Cups, the 2007 Rugby World Cup, as well as the 1960, 1984 and 2016 UEFA European Championships were also held in the city. Every July, the Tour de France bicycle race finishes on the Avenue des Champs-Élysées in Paris. Paris grew in population from about 400,000 in 1640 to 650,000 in 1780. A new boulevard, the Champs-Élysées, extended the city west to Étoile, while the working-class neighborhood of the Faubourg Saint-Antoine on the eastern site of the city grew more and more crowded with poor migrant workers from other regions of France. Paris was the center of an explosion of philosophic and scientific activity known as the Age of Enlightenment. Diderot and d'Alembert published their Encyclopedia in 1751, and the Montgolfier Brothers launched the first manned flight in a hot-air balloon on 21 November 1783, from the gardens of the Château de la Muette. Paris was the financial capital of continental Europe, the primary European center of book publishing and fashion and the manufacture of fine furniture and luxury goods