At the moment we don't have a way of knowing this in a way that could give you the precise numbers or information you're looking for. Certainly when vessels operating in the Arctic have voluntarily notified us, we've been better able to track them.
One of the things that will greatly enhance our ability to do that, as I mentioned in my presentation, is that when we begin this year, and into next year, to roll out the long-range identification tracking system, it will give us for the first time a very good capacity to track vessels in the north. It's satellite-based, rather than relying on land infrastructure. So once that system is fully implemented next year, it will significantly improve our ability to do the type of tracking you're referring to.