Sprite is a transparent, lemon-lime flavored, caffeine free soft drink, produced by the Coca-Cola Company. It was introduced in the United States in 1961. This was Coke's response to the popularity of 7 Up, which had begun as "Lithiated Lemon" in 1929. It comes in a primarily silver, green, and blue can or a green translucent bottle with a primarily green and blue label. In 1978 Sprite became the market leader position in the lemon soda category. Sprite is very popular in Canada as well, the annual sales rate of sprite in Canada is 15 million per year.