The figure of 200 years is the figure we're using that we've been involved in, but I'd also like to stress this 200-year figure did not exist 10 years ago. The advancement of drilling technology, especially the use of fracking, has opened up mass amounts.
If we have as much technology change in the next 10 years as we had in the last 10 years, we are basically back to the infancy stage on gas production and gas drilling. As the technology changes, we are looking at a far greater scope than this 200 years.