The bar chart shows oil production capacity of different countries from 1990 to 2010

The bar chart shows oil production capacity of 6 countries from 1990 to 2010. In general, the number of barrels per day rose steadily after 20 years.
Saudi Arabia was the best producer of oil. The amount of barrels in 1990 was over 8 millions per day and this number increased significantly to over 14 millions per day in 2010. Iran has the second highest number of oil prodution. It was able to produce about 3 millons of barrels in 1990 and added over 1 millons of barrels per day in the next 20 years.
There were 3 countries had similar oil production. They are Iraq, Kwait and UAE. The amount of their products grown from aroud 2 millions to nearly 4 millions of barrels per day between 1990 and 2010. Finally, the lowest production of oil was Quatar. Quatar almost had no change in their production capacity, with 1 millions of barrels per day in the same period of time.