America, North America, Europe, and Asia, between 2006 and 2010.
Overall, it is clearly observed from the digram that, the lowest number of total sales accounted for South America, from 2006 to 2010. It is worth noting that, there is a gradual growth in the percentage of Asia, during the same period.
In 2006, the proportion of Asia stood at 25 %. However the figure for North America and Europe were higher at 30 and 34, respectively. over the next four years the figure for Asia doubled to 50 %. In contrast, there was a dramatic drop in the figure for North America from 30 % to 9 %, between 2006 and 2010.
Between 2006 and 2008, the proportion of Europe rose minimally from 34 % to 38 %, after which it decline gradually by 8%, in 2010. However, the figure for South America saw a minimal fluctuation, at the beging of the period it was the lowest at 11 %, followed by a moderate growth of 6 until 2009 and at the end of the period it rise and stood at 11 % again.