Greenwich
Meridian, Greenwich, England, with the hours and days, since 1925,
reckoned from midnight. GMT is now a historical term having been
replaced by UTC on 1 January 1972. See Coordinated Universal Time.

Gross domestic product: see GDP

Gross national product: see GNP

Gross world product: see GWP

HIV/AIDS - adult prevalence rate: This entry gives an estimate of the
percentage of adults (aged 15-49) living with HIV/AIDS. The adult
prevalence rate is calculated by dividing the estimated number of
adults living with HIV/AIDS at yearend by the total adult population at
yearend.

HIV/AIDS - deaths: This entry gives an estimate of the number of
adults and children who died of AIDS during a given calendar year.

HIV/AIDS - people living with HIV/AIDS: This entry gives an estimate
of all people (adults and children) alive at yearend with HIV
infection, whether or not they have developed symptoms of AIDS.

Heliports: This entry gives the total number of heliports with hard-
surface runways, helipads, or landing areas that support routine
sustained helicopter operations exclusively and have support facilities
including one or more of the following facilities: lighting, fuel,
passenger handling, or maintenance. It includes former airports used
exclusively for helicopter operations but excludes heliports limited to
day operations and natural clearings that could support helicopter
landings and takeoffs.

Household income or consumption by percentage share: Data on household
income or consumption come from household surveys, the results adjusted
for household size. Nations use different standards and procedures in
collecting and adjusting the data. Surveys based on income will
normally show a more unequal distribution than surveys based on
consumption. The quality of surveys is improving with time, yet caution
is still necessary in making inter-country comparisons.

Hydrographic data codes: see Data codes

Illicit drugs: This entry gives information on the five categories of
illicit drugs - narcotics, stimulants, depressants (sedatives),
hallucinogens, and cannabis. These categories include many drugs
legally produced and prescribed by doctors as well as those illegally
produced and sold outside of medical channels.

Cannabis (Cannabis sativa) is the common hemp plant, which provides
hallucinogens with some sedative properties, and includes marijuana
(pot, Acapulco gold, grass, reefer), tetrahydrocann