At the end-user side, I can't speak to what the end product will be going into the vehicle. That's a bit of a challenge, although unconventional gases, be it shale, tight gas, or other unconventional gases, are starting to represent a larger share of the market.
I can't speak to what the end-user share or proportion of the market would be, because we have natural gas coming into North America from several different streams. We have it coming in through import LNG terminals. We have it coming in from conventional sources—for example, northern Alberta and elsewhere. It's hard to determine where that specific molecule comes from that goes into the vehicle in the end use.