Ielts writing task 1, help me to check this essay, thank you so much

The graphs illustrate how many ton of waste manufactured by the firm A, B and C over a course of 15 years starting from 2000.

As can be seen from the graphs, it is clearly evident that the amount of waste of corporation C witnessed an upward trend with exception of that of corporation A and B. Among all 3 corporations, the corporation A registered the highest figure.

In 2000, the company A stood at 12 ton then it dropped gradually at around 9 ton in 20015. In similar trend, the company B started at about 9 ton in 2000 before being increased dramatically to approximately 10 ton in 2005. After that, it declined sharply at 3 ton in 2015.

By contrast, the company C, which was the lowest figure for waste in three companies, was 4 ton in 2000. In the next ten years, it rose modestly to about 7 ton before going up rapidly at 10 ton in 2015.