Population: 18,100,703 (July 1997 est.)
Age structure: 0-14 years: 43% (male 3,928,741; female 3,891,591) 15-64 years: 54% (male 4,775,610; female 4,939,664) 65 years and over : 3% (male 268,579; female 296,518) (July 1997 est.)
Population growth rate: 2.21% (1997 est.)
Birth rate: 33.88 births/1,000 population (1997 est.)
Death rate: 10.89 deaths/1,000 population (1997 est.)
Net migration rate: -0.92 migrant(s)/1,000 population (1997 est.)
Sex ratio: at birth : 1.03 male(s)/female under 15 years: 1.01 male(s)/female 15-64 years: 0.97 male(s)/female 65 years and over: 0.91 male(s)/female total population: 0.98 male(s)/female (1997 est.)
Infant mortality rate: 78.9 deaths/1,000 live births (1997 est.)
Life expectancy at birth: total population: 56.49 years male : 54.47 years female: 58.57 years (1997 est.)
Total fertility rate: 4.43 children born/woman (1997 est.)