I'm not sure that makes sense; normalizing by revenue tells the tale of how much of what the company brings in is devoted to swaying public policy, but I'm not sure what normalizing by revenue from government contracts get you -- presumably, any profit maximizing corporation trying to sway policy is trying to do so for its own benefit, whether the way in which it hopes to receive that benefit is by direct government contracts, or by government policy encouraging (and perhaps even subsidizing) others to purchase the service it sells, or by some other shift in policy that helps the firms business.