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    "to_year": null,
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    "base_year": null
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    "2005",
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    "A shared reporting year does not establish causation or make different measurement definitions equivalent.",
    "National boundaries, methods and source availability may differ between reporting economies."
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  ],
  "article": {
    "id": "africa-output",
    "title": "Two African economies, one price basis.",
    "method": "Shared present annual observations. Original values keep original units.",
    "index": {
      "base_year": 2000,
      "formula": "Each series value / its own value in the shared base year * 100",
      "interpretation": "Proportional change only; neither causation nor equivalence of original units."
    }
  }
}