Can't find the A340 figures either but I assume the enquiry is related to a specific airline on a certain route system...
Just that the A340-300 isn't really an alternative to the B777-300 aside from weights and accomodation, the 777 is a fair bit wider (and longer) so if there's cash to be made from freight then the B777 would be the a/c of choice. The A340-600 is more comparable to the B777-300 HGW (more so the ER) apples for apples.
I'll continue the dredging of Google for facts however....
PP