The risk should be worked out for the individual's exposure, so one would need to take into account factors such as fleet size, flying hours for the fleet and possibly squadrons (depending on differences) and crews, types of flying/roles as they may carry differing risks and exposures. The risk is also calculated for 1st, 2nd and 3rd parties, broadly speaking you could probably think of that respectively as aircrew, ground crew and the public.
So, this is something that AOC 1 Group would be required to calculate, and defend at a FAI.
DV