 Historically, rugby league and rugby union football codes have been more popular than Australian rules football in New South Wales and Queensland, whereas Australian rules football has been more popular in Victoria, Tasmania, South Australia, North Territory and Western Australia.Major professional sports leagues in Australia are similar to major professional sports leagues in the United States and Canada in that they do not practice promotion and relegation, unlike sports leagues in Europe and South America.Australia boasts 7 former world number one squash players, as well as a history of success in the Commonwealth Games.