The bar chart compares the volume of coffee produced from top coffee-producing nations namely Brazil, Vietnam, Indonesia, and Colombia between 2011 and 2013.
It is clear that Brazil is always the biggest coffee producer over the period shown. Also, all the mentioned countries followed an overall upward trend.
In 2011, Brazil produced about 43000 thousand units of coffee, in comparison with about 25000 thousand units by Vietnam. Two years later, after reaching the highest point at more than 50000 thousand units in 2012, the amount of coffee produced by Brazil witnessed a slight decrease, ending the period at roughly 50000 thousand units. In the meantime, the volume of Vietnamese coffee produced fell to approximately 21000 and then remarkably increased to about 28000 thousand units in the final year.
Turning to two remaining nations, in 2011, Indonesia produced roughly 10000 thousand units of coffee, compared with about 7000 thousand units by Colombia. From 2011 onwards, the volume of coffee produced by Indonesia and Colombia experienced gradual increases, ending the period at about 11000 thousand units and more than 10000 thousand units, respectively. 
The bar chart compares the volume of  
coffee
  produced
 from top coffee-producing nations  
namely
 Brazil, Vietnam, Indonesia, and Colombia between 2011 and 2013.
It is  
clear
 that Brazil is always the biggest  
coffee
 producer over the period shown.  
Also
, all the mentioned countries followed an  
overall
 upward trend.
In 2011, Brazil  
produced
 about 43000 thousand  
units
 of  
coffee
,  
in comparison
 with about 25000 thousand  
units
 by Vietnam. Two years later, after reaching the highest point at more than 50000 thousand  
units
 in 2012, the amount of  
coffee
  produced
 by Brazil witnessed a slight decrease, ending the period at roughly 50000 thousand  
units
. In the meantime, the volume of Vietnamese  
coffee
  produced
 fell to approximately 21000 and then  
remarkably
 increased to about 28000 thousand  
units
 in the final year.
Turning to two remaining nations, in 2011, Indonesia  
produced
 roughly 10000 thousand  
units
 of  
coffee
, compared with about 7000 thousand  
units
 by Colombia. From 2011 onwards, the volume of  
coffee
  produced
 by Indonesia and Colombia experienced gradual increases, ending the period at about 11000 thousand  
units
 and more than 10000 thousand  
units
,  
respectively
.