Secondary education has been dominated among Bulgarians who wanted to live abroad in 2000s

Level of education of Bulgarians planning to leave Bulgaria

The graph chart reveals comparison three the percentage of Bulgarian education who wanted to live in another country in 2002,2006, and 2008. Overall, it can be seen that the number of secondary education has been in the top position which the most Bulgarian prefer to choose that.

Based on data, there are three categories of education and the proportion of secondary education became the highest in all of the years which stood at 65% in 2002 and slightly decrease to 59% in the six years later. Then, there was a fluctuation in the number of higher education of Bulgarians planning started at 17 percent and it increased by 3 percent in 2006, also it fell down more than double to 9 percent in the last year.

Interestingly, still there was an increasing trend in the percentage of primary and lower education category which stood at 18% and it improved by 1% in four years, a significant improvement was shown to 32% in 2008.

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1. This phrase is a bit vague since what you are comparing is not the three percentages, but the three levels of education of Bulgarians.
2. Again, 'number' or 'percentage'. Make it sure!
3. Similar with my previous suggestion, you may write two sentences for overview (if possible). Let me give a try:
The graph chart reveals the percentage of Bulgarians with different levels of education who wanted to live in another country over the period 2002 to 2008. Overall, while the proportion of people with higher education who planned to leave the country fell sharply, those with primary and lower one showed a significant rise. Meanwhile, this figure for people with secondary education remained the same and showed the highest percentage.

Hope this helps ~ Shinta.

Thank you very much ms. Shinta. It really helps me for creating an introduction in Task 1. That is great because of combining of 2 sentences.