Hi, dcho. Let me give you some suggestions,
The bar chart illustrates ...
Overall, it can be seen that the ...
Consider to paraphrase the question to put in your introduction. For example: The bar chart illustrates the international fuel and electricity machine markets in three different areas from 2006 to 2009.
As for your overview, you can put the total sales which were doubled in the time frame. Also, the highest sales was the UK before it predominantly undertook by Japan.
As for your body paragraph, you can divide it into two different paragraphs according to your grouping. To exemplify, for the former expains significant change between the UK sales also Japan, and the latter you can put the explanation about the other countries