The chart provides information regarding a comparison in percentage of overseas graduate students from universities based on several regions in Canada from 2001 to 2006.The bar chart compares international graduates in percentage terms from universities in seven regions in Canada in two separate years, 2001 and 2006.
I think you should write an overview after the introduction. This is to mention the most significant features of the chart before going to details in following paragraphs.
According to the graph, in 2001 there were just about 3-to-7 percent graduate pupils from abroad per each region in Canada. However, the following years, the percentage of the overseas students were about 3-8 percent higher than those in 2001
These two sentences are not quite clear as readers may not know whether there is any notable difference between two ranges of figures you stated above (as they are quite similar). You could simply write one sentence about the upward trend and this could be used in the overview.There was a gradual increase in the proportion of international students from 2001 to 2006.
There is still a gap between the figures in 2001 and 2006. If you write like this, it seems that the figures are quite close to each other and the increase is not clearly described.
perhaps decreasing international graduation from its universities, from 2001 to 2006!
which experienced a decrease in the percentage of international graduates
I hope this helps!