(a)Assumes a 15 percent royalty on production.
Note: Private companies = U.S. Total minus majors minus publicly traded companies.
Sources: Majors: Energy Information Administration, Form EIA-28; Publicly traded companies: Arthur Andersen & Co., Oil and Gas Reserve Disclosures, 1981-1985, and Fifteenth Edition 1994 (Chicago, IL 1986 and 1994); Total United States: Energy Information Administration, U.S. Crude Oil, Natural Gas, and Natural Gas Liquids Reserves, DOE/EIA-0216 (Washington, DC, October 1994).