syntactic analysis - placement of 'per year' in a sentence

In the first sentence, the term ‘per year’ is placed within the sentence and in the second sentence, at the end.

Which pattern is correct and which one is wrong?

1. The business purchases about 24 tons of hosiery waste as raw material per year from different suppliers located mainly in Dhaka district.




2. The business purchases about 20 tons of raw materials from different suppliers located mainly in Dhaka district per year.