Imports graph: the decrease in one year as a percentage of the previous year's imports

The same question, asked 2 times: 21 Jul 2023 S4*, 26 Jul 2023 S4. Every wording below, oldest first.

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Question 1
21 Jul 2023 S4
61 $Study the given graph carefully and answer the question that follows. The decrease in imports in 1971 was what percentage of the imports in 1970 (rounded off to the nearest integer)?$
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Question 2
26 Jul 2023 S4
54 $Study the graph carefully. The decrease in imports in 1976 was what percent of the imports in 1975?$
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