Data Provenance Notice: Historical series aggregated by CommoditiesHistory.com are reconstructed from source publications including the U.S. Geological Survey (USGS Data Series 140), World Bank Commodity Markets (Pink Sheet), and U.S. Energy Information Administration (EIA). Inflation adjustments are calculated using the U.S. Bureau of Labor Statistics (BLS) Consumer Price Index (CPI-U) normalized to the published August 2026 reference month. Pre-1913 inflation estimates are derived from USGS tables.
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