describe the changes of oil price Given is a line chart of the change of oil prices per barrel measured by US dollars from the year 1995 to the year 2015 by prediction. It is obvious that there is a dramatic increase throughout the twenty years, where the starting point is just 20 dollars per barrel but might reach 130 dollar in the year 2015. Also, we can see that the oil price dropped to a lowest level at 18 dollars in the year 2000, though experienced a slightly raise in before the year 1998. Since then, the oil price soared to 50 dollars and 120 dollars in the year 2007 and 2010 respectively.