text: services during the Decade, particularly in urban areas. The number of cities in the world with a population size of 5 million or more has increased from 24 in 1980 to 35 in 1990. nf these, 15 in 1980 and 24 in 1990 are in developing countries, particularly in Asia and Latin America, The population in mega-cities of developing countries grew sharply from 130 million in 1980 to an estimated 228 million in 1990. The population of 23 cities in Africa south of the Sahara grew from 21 million in 1980 to 36 million in 1990. In the region north of the Sahara, eight cities, which accounted for 17 miilion people in 1980, grew to 25 million by the end of the decade. L2/ /. . .2.Table Water supply and sanitation coverage by r-ion, 1980-1990, and covecaqe for 2000 at current rates of progress (Population in millions) Region/sector1980 1990 2000 a No. N3. a No. No. a No. No. Population coverage served unserved Population coverage served unserved Population coverage served unserved Africa Urban water 119.77 83 99.41 Rural water 332.83 33 109.83 Urban sanltatlon 119.77 65 77.85 Rural sanltatlon 332.83 18 59.91 Latin America and the Cacrbbean Urban water 236.72 82 194.11 42.61 324.08 87 281.95 42.13 416.79 89 369.79 47.00 Rural water 124.91 47 58.71 66.20 123.87 62 76.80 47.07 122.84 ?7 94.89 27.95 Urban sanitation 236.72 78 184.64 52.08 324.08 79 256.02 68.06 416.79 79 327.40 89.39 Rural sanitation 124.91 22 27.48 97.43 123.87 37 45.83 78.54 122.84 52 64.18 58.66 Asia and the Pacif x Urban vater 549.44 73 401.09 148.35 761.18 77 586.11 175.07 1085.56 71 771.71 314.43 Rural water 1 823.30 28 510.52 1 312.78 2 099.40 671 406.60 692.80 2 320.79 992 302.68 10.11 Urban sanitation 549.44 65 357.14 192.30 761.18 65 494.77 266.41 1 085.56 58 632.40 453.16
analysis: The text discusses population growth and urbanization, specifically in developing countries, and provides statistics on water supply and sanitation coverage. This suggests that the text is related to the social and economic development of these countries, particularly in terms of infrastructure and public services.