Equatorial Guinea is divided into seven provinces, which are further divided into thirty districts. In 1994, there were only seventeen districts. They can be located on this page , apparently an official government website, with links to seven province pages with maps showing the division of the provinces into districts. This PDF document  from Marathon Petroleum has a map of the whole country showing the same division into districts (page 12). I haven't been able to find any maps of the thirty districts yet.

Change history:

~1997: Thirteen new districts were apparently created between 1994 and 2001.

Other names of subdivisions:

1. Annobón: San Antonio Palea (variant)
2. Micomeseng: Micomiseng (variant)

Population history:

1983, 1994: census data.

Source for 2001 populations: Dirección General de Estadística y Cuentas Nacionales . (Thanks to Samuel Villavicencio for this link.) Paolo Pagani has pointed out that the implied growth rate from 1994 to 2001 is impossibly high. These figures should not be considered reliable.