Coffee is a brewed drink made from roasted coffee beans, which are native to Africa and parts of Asia. Worldwide coffee production was about 6.7 million metric tons annually from 1998-2000, and is forecast to rise to 7 million metric tons by 2010. The caffeine content of coffee can vary greatly depending on the type and preparation method. Coffee is often consumed as part of breakfast or after meals, and was initially used in religious ceremonies by Muslim dervishes in Yemen over 1,100 years ago.