Population: 18,497,206 (July 1998 est.)
Age structure: 0-14 years: 43% (male 3,985,219; female 3,947,640) 15-64 years: 54% (male 4,905,442; female 5,077,521) 65 years and over: 3% (male 275,192; female 306,192) (July 1998 est.)
Population growth rate: 2.13% (1998 est.)
Birth rate: 32.81 births/1,000 population (1998 est.)
Death rate: 10.63 deaths/1,000 population (1998 est.)
Net migration rate: -0.9 migrant(s)/1,000 population (1998 est.)
Sex ratio: at birth: 1.03 male(s)/female under 15 years: 1 male(s)/female 15-64 years: 0.96 male(s)/female 65 years and over: 0.89 male(s)/female (1998 est.)
Infant mortality rate: 77.53 deaths/1,000 live births (1998 est.)
Life expectancy at birth: total population: 56.82 years male: 54.77 years female: 58.92 years (1998 est.)
Total fertility rate: 4.27 children born/woman (1998 est.)