Population: 21,722,287 (July 1998 est.)
Age structure: 0-14 years: 44% (male 4,865,820; female 4,711,791) 15-64 years: 53% (male 5,794,336; female 5,662,163) 65 years and over: 3% (male 320,672; female 367,505) (July 1998 est.)
Population growth rate: 3.2% (1998 est.)
Birth rate: 38.58 births/1,000 population (1998 est.)
Death rate: 6.57 deaths/1,000 population (1998 est.)
Net migration rate: 0 migrant(s)/1,000 population (1998 est.)
Sex ratio: at birth: 1.05 male(s)/female under 15 years: 1.03 male(s)/female 15-64 years: 1.02 male(s)/female 65 years and over: 0.87 male(s)/female (1998 est.)
Infant mortality rate: 62.41 deaths/1,000 live births (1998 est.)
Life expectancy at birth: total population: 66.52 years male: 65.54 years female: 67.56 years (1998 est.)
Total fertility rate: 5.23 children born/woman (1998 est.)