The bar chart illustrates the estimated amount of oil produced in 6 countries between 1990 and 2010, measured in millions of barrels per day.
Overall, oil production capacity experienced corresponding increase over a twenty-year period. The figures for Saudi Arabia were significantly higher than in the other countries, while production in Qatar was the lowest among the six countries.
In detail, oil production in Saudi Arabia depicted a significant increase, starting at just over 8 million barrels per day in 1990 then rising steadily, reaching a peak of over 14 million barrels per day in 2010. Conversely, despite a slight increase in 2000, production in Qatar remained relatively stable at less than 1 million barrels per day.
The other countries experienced a slight rise in oil production over the period. The estimated figure for Iran in 1990 was slightly higher at over 3 million barrels per day, whereas the other three countries remained around 2 million barrels. Over the next twenty years, the amount of oil produced in Iran peaked at just over 4 million barrels, while the oil production in Iraq, Kuwait, and UAE reached almost 4 million barrels.