The Fox Broadcasting Company, is an American commercial broadcast television network that is owned by the Fox Entertainment Group division of 21st Century Fox. The network is headquartered on Pico Boulevard in Los Angeles, with additional major offices and production facilities at the Fox Television Center in Los Angeles and in Manhattan. It is the third largest major television network in the world, based on total revenues, assets and international coverage.Launched on October 9, 1986 as a competitor to the three longer-established U.S. commercial television networks, ABC, NBC and CBS, Fox went on to become the most successful attempt at a fourth television network. It was the highest-rated broadcast network in the 18–49 demographic from 2004 to 2012, and earned the position as the most-watched network in the United States overall in total viewership during the 2007–08 season.Fox and its affiliated companies operate many entertainment channels in international markets, although these do not necessarily air the same programming as the U.S. network. Most viewers in Canada have access to at least one U.S.-based Fox affiliate, either over-the-air or through a pay television provider; although most of Fox's prime time programming, as well as its National Football League telecasts, is subject to simultaneous substitution regulations for cable and satellite providers imposed by the Canadian Radio-television and Telecommunications Commission to protect rights held by domestically based networks.