{
  "industry": "Mining (except Oil & Gas)",
  "naics": "212",
  "grain": "national",
  "net_margin_pct": 5.4,
  "as_of_tax_year": "2023",
  "source": "https://www.irs.gov/pub/irs-soi/23sp02is.xls",
  "confidence": 0.55,
  "cv_pct": null,
  "note": "National figure. No local margin exists in any source; do not infer one."
}