Obviously having asked the question I don't have an immediate answer - thinking that there maybe existing knowledge out there. Many responses seem to indicate that the data however would be in some way secret but I'm not so sure.
The list price for any aircraft must be broadly known and even if it wasn't at the time I can hardly see why the price of a (say) Vickers Viscount would be kept secret in 2018. Development costs for any project seem to be widely known for many military projects (I'm thinking for example TSR2). I'd have thought this subject of cost v revenues would have had an airing by now but perhaps not.