Note: Replacement rate = Reserve additions/production.
Nonmajors = Total United States (less 15 percent royalty interest) minus majors.
Sources: Majors: Energy Information Administration, Form EIA-28; Total United States: Energy Information Administration, U.S. Crude Oil, Natural Gas, and Natural Gas Liquids Reserves, 1989-1993 issues, DOE/EIA-0216 (Washington, DC).