Source: International Monetary Fund  

Release: Primary Commodity Prices  

Units:  U.S. Dollars per Metric Ton, Not Seasonally Adjusted

Frequency:  Monthly

Value represents the benchmark prices which are representative of the global market. They are determined by the largest exporter of a given commodity. Prices are period averages in nominal U.S. dollars.

Copyright © 2016, International Monetary Fund. Reprinted with permission. Complete terms of use and contact details are available at http://www.imf.org/external/terms.htm.

Source: Federal Reserve Bank of St. Louis  

Release: Spliced Oil Price

Units:  Dollars per Barrel, Not Seasonally Adjusted

Frequency:  Monthly

This series was created by the Federal Reserve Bank of St. Louis to expand the history of the monthly West Texas Intermediate oil price series in FRED. We simply combined these two FRED series: https://fred.stlouisfed.org/series/OILPRICE and https://fred.stlouisfed.org/series/MCOILWTICO. From January 1946 through July 2013, the series used is OILPRICE. From August 2013 to present, the series used is MCOILWTICO.

Source: U.S. Energy Information Administration  

Release: Natural Gas Spot and Futures Prices (NYMEX)  

Units:  Dollars per Million BTU, Not Seasonally Adjusted

Frequency:  Monthly

More information about this series can be found at http://www.eia.gov/dnav/ng/TblDefs/ng_pri_fut_tbldef2.asp