The bar graph illustrates the daily changes in Oil Production Capacity for six different countries and is measured in millions of barrels.
Overall, it is apparent that the generation of oil capacity in Saudi Arabia was the highest and significantly higher than that of the other remaining countries, whereas the oil producing quantity of Qatar, throughout the given period, was the lowest in all countries.
According to the graph, in 1990, the estimated oil generating capability in Iran was around 3 million of barrels each day which was followed by a gradual increase to reach 4 million in 2010. Moreover, the level of oil capacity in Iraq was lower than the production of Iran, while Kuwait witnessed the same level of oil generation with Iraq over the decade, though, the oil generation capacity in Kuwait saw a steady drop in 1990. Likewise, UAE’s oil production level followed a similar pattern with Iraq; however, the output of the UAE in 1990 accounted for over 2 million which is the same level of production with Iraq, Kuwait, and UAE in 2000.
Furthermore, the daily output of oil from Qatar was the lowest for the following 15 years period
And on the contrary, Saudi Arabia produced more than 8 million and reached its peak of approximately 15 million barrels in 2010. 
The bar graph illustrates the daily  
changes
 in  
Oil
  Production
  Capacity
 for six  
different
 countries and  
is measured
 in  
millions
 of barrels. 
Overall
, it is apparent that the generation of  
oil
  capacity
 in Saudi Arabia was the highest and  
significantly
 higher than that of the other remaining countries, whereas the  
oil
 producing quantity of Qatar, throughout the  
given
 period, was the lowest in all countries.
According to the graph, in 1990, the estimated  
oil
 generating capability in Iran was around 3  
million
 of barrels each day which  
was followed
 by a gradual increase to reach 4  
million
 in 2010.  
Moreover
, the  
level
 of  
oil
  capacity
 in Iraq was lower than the  
production
 of Iran, while Kuwait witnessed the same  
level
 of  
oil
 generation with Iraq over the decade, though, the  
oil
 generation  
capacity
 in Kuwait  
saw
 a steady drop in 1990.  
Likewise
, UAE’s  
oil
  production
  level
 followed a similar pattern with Iraq;  
however
, the output of the UAE in 1990 accounted for over 2  
million
 which is the same  
level
 of  
production
 with Iraq, Kuwait, and UAE in 2000. 
Furthermore
, the daily output of  
oil
 from Qatar was the lowest for the following 15 years period
And  
on the contrary
, Saudi Arabia produced more than 8  
million
 and reached its peak of approximately 15  
million
 barrels in 2010.