I'm sure these numbers are readily available on some website, but I would have to agree that the late-80's early-'90's Fox-bodied Mustangs had to be a big money maker for Ford, due to the long stretch between retooling.
I paid $13,600. for my fairly loaded LX 5.0 in 1990 and that was still considered a steal back then. Best investment I ever made and I still have it as my daily driver (104k).
Ford Rules!