The line graph below illustrates how much waste was generated per year by three different companies

the amounts of waste produced by 3 companies in last 15 years

The line graph below illustrates how much waste was generated per year by three different companies between 2000 and 2015. Overall, companies A and B produced less and less waste and company C produced more and more during this period.

Company A generated 12 tonnes of waste in 2000 and the weight decreased to about 11 tonnes in 2005. 5 years later in 2010, it dropped to 9 tonnes. The tendency continued between 2010 and 2015 with the amount of waste going down to less than 9 tonnes. Around 8 tonnes of waste was generated by company B and the number increased to about 10 tonnes in 2005, then decreasing to around 7 tonnes, in the end dropping to 3 tonnes in 2015.

Different from company A and B, company C produced more and more waster in a year. In 2000, only about 4 tonnes of waste was generated. It went up to 6 tonnes in 2005, later rising to about 7 tonnes, ending up with around 10 tonnes in 2015.

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- should not use "below" in introdution.
- overall section does not attract readers.
- detail sections, I think you can use more structures such as comparison in body 1, "a peak of", "to the lowest point", C overtook A and B to become ... in body 2.

Hi shinxg!
The introduction and overview caused me a bit confusion. Firstly, the unit are not mentioned (tonnes) in the first paragraph. It would be beter if you can make the comparison clearer, instead of "less and less" or "more and more".

It can be seen that you seem focus too much on the figures of each year in a certain company without comparing it with others. Using more vebs besides "generated" would help a better writting.