That's interesting. It would seem to suggest that Pakistanis we captured in Afghanistan were Pushtu tribesmen from the Northwest Frontier Province and Baluchis from Baluchistan, as opposed to Urdu-speaking Punjabis. (On the other hand, I wonder if we released all or most captured Pakistanis to Pakistan.)
Those %'s were the ones for Afghanistan as a whole, not the detainess at Gitmo, aristeides, so we prolly can't draw any conclusions re: the breakdown of languages at Gitmo (if only we could take a peek at one of the spy's laptops! :).
Come to think of it, chances are that many do speak Arabic, I think I read that many non-Arab muslims do so they can read the mooselimb voodoo book in its native voodoo language.