Bar graph: average over some years is what percent more or less than another average

This type of question, asked 2 times: 29 Jan 2022 Tier II, 3 Feb 2022 Tier II. All 2 questions below, oldest first.

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Question 1
29 Jan 2022 Tier II
70 $Study the given graph and answer the question that follows. The average production of fertilisers by country Z in 2017, 2018 and 2020 is what percentage more than the average production of fertilisers by country X in 2018 and 2020?$
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Question 2
3 Feb 2022 Tier II
51 $Study the given graph and answer the question that follows. The average production of cement by company B in 2015, 2016 and 2018 is what percentage less than the average production of cement by company C in 2015 and 2017?$
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Question 1