The line graph gives information about the historical oil prices per barrel between 1973 and January 2009, over a period of 36 years.
Overall, it can be seen that the oil price experienced the highest price in 2006. By contrast, the amount of money showed the lowest price from the beginning year.
In terms of oil, the amount of money started at about 2 dollars in 1973, after that the price reached at almost 9 dollars in 1979, before increasing to about 15 in 1985. Afterwards, between 1985 and 1994, the amount of price fluctuated moderately and reached to about 20 dollars in 1997. By 2000, the price had increased to about 23 dollars. The price of oil climbed slightly to 26 dollars in 2003. By 2006, the figure had climbed to 140 dollars, which was the highest price. In 2009, the price of oil decreased slowly to 39 dollars.