oss domestic product (GDP); the GDP is calculated on an exchange rate
basis, i.e., not in terms of purchasing power parity (PPP).

Military service age and obligation: This entry gives the required
ages for voluntary or conscript military service and the length of
sevice obligation.

Money figures: All money figures are expressed in contemporaneous US
dollars unless otherwise indicated.

National holiday: This entry gives the primary national day of
celebration - usually independence day.

Nationality: This entry provides the identifying terms for citizens -
noun and adjective.

Natural gas - consumption: This entry is the total natural gas
consumed in cubic meters (cu m). The discrepancy between the amount of
natural gas produced and/or imported and the amount consumed and/or
exported is due to the omission of stock changes and other complicating
factors.

Natural gas - exports: This entry is the total natural gas exported in
cubic meters (cu m).

Natural gas - imports: This entry is the total natural gas imported in
cubic meters (cu m).

Natural gas - production: This entry is the total natural gas produced
in cubic meters (cu m). The discrepancy between the amount of natural
gas produced and/or imported and the amount consumed and/or exported is
due to the omission of stock changes and other complicating factors.

Natural gas - proved reserves: This entry is the stock of proved
reserves of natural gas in cubic meters (cu m). Proved reserves are
those quantities of natural gas, which, by analysis of geological and
engineering data, can be estimated with a high degree of confidence to
be commercially recoverable from a given date forward, from known
reservoirs and under current economic conditions.

Natural hazards: This entry lists potential natural disasters.

Natural resources: This entry lists a country's mineral, petroleum,
hydropower, and other resources of commercial importance.

Net migration rate: This entry includes the figure for the difference
between the number of persons entering and leaving a country during the
year per 1,000 persons (based on midyear population). An excess of
persons entering the country is referred to as net immigration (e.g.,
3.56 migrants/1,000 population); an excess of persons leaving the
country as net emigration (e.g., -9.26 migrants/1,000 population). The
net migration rate indicates the contribution of migration to the
overall level of population chang