The percentage of Bulgarians abroad who have secondary education was higher than others

The chart below give information about the level of education of Bulgarian people who wanted to go and live in another country in 2002, 2006 and 2008.
Summarize the information by selecting and reporting the main features, and make comparisons where relevant.

The chart shows about the percentage of education steps for Bulgarian society who wanted to stay and growth in the abroad foreign in 2002, 2006 and 2008. Overall, it can be seen that over two-year's period, the percentage of people who have secondary education was higher than others and it has decreased slightly trend.

The people who have senior education fluctuated over two-year's period. In 2002, society with higher education was at 17 percent. After two years, it was a gradual increase at 20 percent in 2006. Then, it fell extremely at 9 percent in 2008. Besides that, the society who have junior education was at 65 percent in 2002. Furthermore, it was a slight decrease at 61 and 59 percent in 2006 and 2008 respectively. The last category is people who have elementary school. It was 18 percent in 2002, followed by increase slowly at 19 percent in 2006 and it rose significantly at 32 percent in 2008. Between 2002 and 2006 people who have education levels in primary and lower was the second greatest after higher education.

Hello Willy!
Allow me to give you some suggestion :)

...and it has decreased slightly trend. (showed downward trend).
I think t will better if you make a comparison by using "but"
... people who have secondary education was higher than others but it showed downward trend over those years.

..., it was a gradual increasedat 20 percent in 2006 . Then, it felt extremelyat 9 percent in 2008.
... have junior education was at 65 percent in 2002.
... by increase slowly at 19 percent in 2006 and it rose significantlyat 32 percent in 2008 .

There are so many presence of number in same style. Try to make it by comparison or devation.
Past tense

Keep fight Willy!
Break a leg :)

Hello Miss Willy :)
Let's discuss your summary :)

The chart shows about => (redundant preposition ) the percentage of education steps for Bulgarian society => (Bulgarian is include the meaning of citizen, society, people of group and etc .) who wanted to stay and growth in the abroadbroad foreign in 2002,...

=> Better if you use similar words such as degree or level than "steps "
=> growth => I think this words not suitable for your passage. Seemingly make your passage become odd meaning.

Well miss Willy :) Keep Practice :)