I wouldn't say I have the expertise to say percentage-wise.
Obviously, one of the reasons bitumens in particular trade below North American prices is because they tend to be heavier, so that quality differentiation is definitely part of the cost, and that's a natural thing.
My understanding is that the differential has shrunk, and it's smaller than it has been relative to a couple of years ago when it reached tens of dollars in amount. The difference is that even though it might have shrunk, it's obviously a very sensitive time, so that any difference is impacting the bottom line of firms. Even though the differential has shrunk, it still matters to the competitiveness of Canadian oil firms.
Being able to remove the part of the lower cost that's coming from transportation bottlenecks through having pipe to tidewater would help with the competitiveness of the industry, even though the specific bottlenecks are small. It flares up depending on whether there's other production from other parts of the States coming online and whether refineries or storage facilities are open or closed and how much they have in them. It really does vary over time. I couldn't give you a percentage.