Red Bull's slogan, "it gives you wings", is widely used in these marketing activities. Claims about the drink's effects and performance have been challenged on various occasions, with the UK's Advertising Standards Authority imposing advertising restrictions in 2001 in response to complaints first recorded as early as 1997. Even with all of the concerns regarding Red Bull, in 2000 the corporation earned around $1 billion in worldwide sales and Red Bull held 65% of the market share.