d
Zimbabwe.

Population below poverty line
National estimates of the percentage of the population falling below
the poverty line are based on surveys of sub-groups, with the results
weighted by the number of people in each group. Definitions of poverty
vary considerably among nations. For example, rich nations generally
employ more generous standards of poverty than poor nations.

Population growth rate
The average annual percent change in the population, resulting from a
surplus (or deficit) of births over deaths and the balance of migrants
entering and leaving a country. The rate may be positive or negative.
The growth rate is a factor in determining how great a burden would be
imposed on a country by the changing needs of its people for
infrastructure (e.g., schools, hospitals, housing, roads), resources
(e.g., food, water, electricity), and jobs. Rapid population growth can
be seen as threatening by neighboring countries.

Ports and harbors
This entry lists the major ports and harbors selected on the basis of
overall importance to each country. This is determined by evaluating a
number of factors (e.g., dollar value of goods handled, gross tonnage,
facilities, military significance).

Public debt
This entry records the cumulative total of all government borrowings
less repayments that are denominated in a country's home currency.
Public debt should not be confused with external debt, which reflects
the foreign currency liablities of both the private and public sector
and must be financed out of foreign exchange earnings.

Radio broadcast stations
This entry includes the total number of AM, FM, and shortwave broadcast
stations.

Railways
This entry states the total route length of the railway network and of
its component parts by gauge: broad, standard, narrow, and dual. Other
gauges are listed under note.

Reference maps
This section includes world and regional maps.

Refugees and internally displaced persons
This entry includes those persons residing in a country as refugees or
internally displaced persons (IDPs). The definition of a refugee
according to a United Nations Convention is "a person who is outside
his/her country of nationality or habitual residence; has a well-
founded fear of persecution because of his/her race, religion,
nationality, membership in a particular social group or political
opinion; and is unable or unwilling to avail himself/herself of the
protection of that country, or