A business report

Is "free time food" the name of the company? If it is, you should capitalize the first letter of each word: "Free Time Food".

Report on free time food’s performance 2000
Introduction
This report is aimed to at presenting free time food’s performance in 2000.
Facts
• Overall, the company performed quite well with a 7% increase of in sales, but some part of the company's business is not satisfying (I think satisfactory would be better).
• The hot weather stimulated sales in Q3. Meanwhile, the share price finished at $12. Compared with the beginning of the year, the price is up 20% up. Obviously, sales results promoted share price.

• Ice cream and cold drinks sell well, with a 6% increase and 8% increase in sales respectively.

(Note: you should not start a sentence with a number! People do this in casual conversation, for example: "How old are you?" "35 years old." but in written English, it is not proper. For example, "6% increase" is wrong. Also, the sentence "6% increase and 8% increase respectively" has no subject, so it is not a correct sentence.)

Here, you need "with a" or you have a comma splice, which means two clauses connected with a comma instead of a conjunction, which is incorrect:

However, health food sales did badly, with a 10% decrease when compared with the same period of last year. Besides, snack sales decreased slightly, about 3% slightly; vitamin sales remained almost the same as last year with a decrease of 1% but they kept the same as last year almost.

Summary

In general, our company did an excellent job last year. Of course, some issues should be improved addressed.

If you have any questions or if I can help more, please let me know!