What this resource explains
Document sources, update dates, rounding, revisions, and limitations for the research center. Values shown are demonstration values unless a source and observation date are explicitly stated.
Research and update standards
- Retrieve the newest observation from the official source.
- Record the release date and observation period.
- Preserve prior values when revisions occur.
- Update the chart data and explanatory text.
- Run a factual and editorial review before publication.