Explain this permitted chart for [reader and question].
First list the title, axes, units, categories and values you can actually
read. Mark unreadable or absent information explicitly. Describe visible
relationships without inventing exact data, dates, definitions or causes.
If an exact calculation requires source data, ask for it. Keep any rough
visual estimate clearly separate from a supplied measured value.
Do not treat an attractive chart as evidence of a causal explanation.

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Map each material statement in your explanation to a readable chart
element or supplied source value. Identify exact figures inferred from
shape alone and causes not supported by the source. Keep the useful
visible relationship but request the data or definition needed for
precision. Do not fill missing evidence with a plausible narrative.

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Use this supplied chart-source table for exact values. Check its period,
categories, units and scope against the image. Replace unsupported visual
estimates with source values and retain unresolved mismatches.
Do not invent a cause. Show any calculation and its inputs, with a
plain-language explanation that preserves source qualifications.
