{
  "source": "Ministry of Finance Japan, JGB Interest Rate (constant-maturity yields)",
  "source_urls": [
    "https://www.mof.go.jp/english/policy/jgbs/reference/interest_rate/historical/jgbcme_all.csv",
    "https://www.mof.go.jp/english/policy/jgbs/reference/interest_rate/jgbcme.csv"
  ],
  "licence": "Public Data License 1.0 (PDL 1.0), Government of Japan",
  "attribution": "Source: Ministry of Finance Japan, JGB Interest Rate (PDL 1.0)",
  "units": "percent per annum",
  "missing_values": "empty cell: MOF published no quote for that maturity on that date; never zero",
  "last_date": "2026-10-09",
  "publisher": "Japan Yield Curve, https://japanyieldcurve.com/",
  "file": "jgb-yields-history.csv",
  "columns": {
    "date": "session date, YYYY-MM-DD",
    "1Y": "1Y yield, percent",
    "2Y": "2Y yield, percent",
    "3Y": "3Y yield, percent",
    "4Y": "4Y yield, percent",
    "5Y": "5Y yield, percent",
    "6Y": "6Y yield, percent",
    "7Y": "7Y yield, percent",
    "8Y": "8Y yield, percent",
    "9Y": "9Y yield, percent",
    "10Y": "10Y yield, percent",
    "15Y": "15Y yield, percent",
    "20Y": "20Y yield, percent",
    "25Y": "25Y yield, percent",
    "30Y": "30Y yield, percent",
    "40Y": "40Y yield, percent"
  },
  "first_quote": {
    "1Y": "1974-09-24",
    "2Y": "1974-09-24",
    "3Y": "1974-09-24",
    "4Y": "1974-09-24",
    "5Y": "1974-09-24",
    "6Y": "1974-09-24",
    "7Y": "1974-09-24",
    "8Y": "1974-09-24",
    "9Y": "1974-09-24",
    "10Y": "1986-07-05",
    "15Y": "1991-08-30",
    "20Y": "1986-12-01",
    "25Y": "2004-03-22",
    "30Y": "1999-09-02",
    "40Y": "2007-11-06"
  }
}