Question: How many copies have been sold of a four book series featuring Bella Swan and Edward Cullen?
Sentence (from "Twilight (novel series)"): Released annually from 2005 through 2008, the four books chart the later teen years of Isabella "Bella" Swan, a girl who moves to Forks, Washington, and falls in love with a 104-year-old vampire named Edward Cullen.
Relevant evidence: Yes