Based on revenue, the four major professional sports leagues in the United States are Major League Baseball (MLB), the National Basketball Association (NBA), the National Football League (NFL), and the National Hockey League (NHL). The market for professional sports in the United States is roughly $69 billion, roughly 50% larger than that of all of Europe, the Middle East, and Africa combined. All four enjoy wide-ranging domestic media coverage and are considered the preeminent leagues in their respective sports in the world, although American football does not have a substantial following in other nations. Three of those leagues have teams that represent Canadian cities, and all four are the most financially lucrative sports leagues of their sport. Major League Soccer (MLS) also includes teams based in Canada. With an average attendance of over 20,000 per game, MLS has the third-highest average attendance of any sports league in the U.S. after the National Football League (NFL) and Major League Baseball (MLB), and is the seventh-highest attended professional soccer league worldwide.