IELTS_ writing task 1

Hello I am a student and I started learning ielts. Now I'm practicing for writting task 1 in ielts, but I am not sure about my writing. Please help me.....

The line graph illustrates the number of wheat exports in three different areas between 1985 and 1990.
overall, all three saw considerable fluctuations, while the Canada saw the most dramatic changes in the terms of wheat exports.
All the lines on the graph have the same starting figure in 1985. In 1985 the number of wheat exports in the Canada was highest about 20 million tonnes. The figures for European community was lower around 17 million tonnes and the figure for Australia was lowest at 15 million tonnes. In 1988, the proportion of wheat exports in Canada reached its highest point at 25 million tonnes ( rose to about 5 million tonnes). However, Australia saw a fall in wheat exports around 11 million tonnes. the 1988s saw a slight fall in European community at 15 million tonnes.
In 1990, around 20 millions of tonnes of European community compare to about 19 million tonnes in Canada. The number of wheat exports in Australia dropped from 15 million to around 11 million between 1985 and 1990, a fall of about 4 million in 5 years.

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