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The line graph illustrates the oil price per barrel from 1973 to January 2009. In general, the graph indicated a fluctuating trend over the period of time,
To specify, in 1073, one oil barrel was sold at approximately 5 dollars and slightly increased in several years later. There was a rise to the peak of about 40 dollars per oil barrel in 1980. The oil sale per barrel witnessed a gradual downward trend from about 35 dollars in 1982 to 115 dollars in 1985. There was a slightly increase in the oil price to around 30 dollars per barrel in 2000. Afterward, there was a considerable growth in the oil sale to over 140 dollars per barrel in 2008. However, it rapidly decreased to 45 dollars per barrel in January, 2009.