Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

In its annual accounts Tata Steel UK said that average revenue per tonne of steel it produced had fallen 6pc, because of “downward pressure on steel selling prices, caused primarily by lower raw material prices”.

Answer: product_or_material_produced: Tata Steel, steel