Well, we made an adjustment of $2.5 billion to take account of the decline in the oil price from the time the latest economic forecast was prepared by the 15 independent economic advisers, who independently produce their numbers.
I should say that we didn't have time to go back to all of them. We went back to a few. We consulted some public sources, and we made the adjustments for the decline, making the assumption, which is a very conservative assumption, that the prices at that time would stay for the entire period.