This is Bill Roberts speaking.
I guess, from our perspective, the rate of return is going to be very much dependent on the commodity price assumptions used, as these projects typically run for many years. That's really key to coming up with a conclusion on what sort of rate of return these projects are earning.
What we've seen--and further to this escalation in costs and this theme that keeps coming up--is that as far as the oil sands have been concerned, that has eroded, to a significant degree, those returns earned by projects. If you're looking at $45 crude, which, again, is a typical price that a lot of major oil companies will use for planning purposes because they can't rely on $60 or $100 oil to remain for the next 40 years while their projects operate, then you're seeing returns that are in the high single digits. If you compare that against returns that would have existed a number of years ago, when costs were significantly lower, those two sort of roughly equate, as far as returns go.