these are my thoughts about your writing task 1. I hope these can help to finalize yours.
I only wanna remind you should create at least 3 sentences in a paragraph. Therefore, you should separate your overview become two distinct sentences. Besides that, you ought to be able to sharpen your overview. Picking up the general trend is a way to get a higher score. The overview is one of points in the task achievement. You view the condition in the whole period so that you can find that key feature.
After that, you should be more aware of ordering the information. Be careful of place the number in the body paragraph. When it doesn't represent appropriately, it can reduce your score. For example, this is your information.
USA and Sweden were about 3 percent that led by USA of 10 percent
USA did not state at 10 percent exactly. You are supposed to write "approximately 10%".
However, there is the crucial point which you have presented. You have had a bravery to compare figures. It can boost your score because you make your description more interesting. I really believe you can obtain the higher your score if you can diminish your repetition.
The key to being the master in the writing task is practicing more and more.
Happy writing, good Luck