Referring to an event which happens yearly. More pacifically it can refer to a book (usually coming out as a magazine, comic or comic strip) which comes out yearly. If its not a book or a comic, it may be brought out to praise some celebrity or celebrities, or even a holiday camp (such as the Butlins[?] annual).
... racial makeup of the town is 96.20% White, 0.57% African American, 0.06% Native American, 1.41% Asian, 0.02% Pacific Islander, 0.96% from other races, and 0.78% from tw ...