heres a link http://www.boxofficemojo.com/movies/?id=starwars3.htm with numbers.
suprisingly (at least i think it is) ROTS was only number 3 for number of theaters it was released in. *edit* number 3 for this weeks release at any rate, looks like its 12 for opening day release.
also, was checking out some of the other stats/rankings and so far it is ranked 8 for the SW franchise, which includes the SE's
-Darth Simon