Thank you.
Let's move on to oil prices for a moment here. I notice that you mentioned in your opening remarks that you expect the price of oil to range between $50 and $66 for the next five years, from 2015 to 2020. We all know that oil prices are extremely volatile. We've seen them move several dollars in a day and multiple dollars in a week and certainly in a month. You're talking about a five-year period when they're only moving a very small amount. Can you explain your rationale behind that?