Explanatory Notes on Main Statistical Indicators

Proved Amount in Place is the tonnage of crude coal, crude petroleum, nature gas that has been both carefully measured and assessed.

Proved Recoverable Reserves are the tonnage of the proved amount in place that can be recovered under present and expected local economic conditions with existing available technology.

Commercial Energy Use refers to apparent consumption, which is equal to indigenous production plus imports and stock changes, minus exports and fuels supplied to ships and aircraft engaged in international transport.

Primary Energy Production Including in the production of commercial primary energy for solids are hard coal, lignite, peat and oil shale; liquids are comprised of crude petroleum and natural gas liquids; gas comprises natural gas and natural gas liquids; electricity is comprised of primary electricity generation from hydro, nuclear, geothermal, wind, tide wave and solar sources.

Bunkers Airs bunkers refer to bunkers of aviation gasoline and jet fuel. Sea bunkers refer to bunkers of hard coal, gas-diesel oil and residual fuel oil.

Energy Consumption Including in the consumption of commercial energy for solids are consumption of primary forms of solid fuels, net imports and changes in stocks of secondary fuels; liquids are comprised of consumption of energy petroleum products including feed stocks, natural gasoline, condensate, refinery gas and input of crude petroleum to thermal power plants; gases including the consumption of natural gas, net imports and changes in stocks of gasworks and coke-oven gas; and Electricity is comprised of production of primary electricity and net imports of electricity.

Consumption=Production Imports-Exports-Bunkers-Changes in stocks

Balance An unallocated has been created in order to balance out the difference between the results of the above formula for consumption and the total consumption. This inequality occurs primarily because of the exclusion of non-energy petroleum products as well as inadequate or unavailable stock data.