Jurek
Thank you for posting this graph but the conclusion you take from it might still be incorrect. To illustrate I will start with an example of the same type of almost exact correlation. A few years ago a scientist found an almost exact correlation of the increase in population of people in a coastal city with the population of storks in the area. Using your analogy you might conclude that the population of people increased with the number of storks when in reality it was the other way around. The storks were drawn to the area because of the waste dumps and the amount of food in the waste dumps increased as the population increased, drawing in more storks.
It is not suprising that there is good correlation between the price of oil and the dollar's decline but in my opinon they are both due to the root cause that oil is a finite resource and its availability is declining.
Martin