| Year | Total urban population (Million) | Urban population (% total) | Average annual growth (%) | Total WGR (ton/day) | Average WGR (kg/cap/ day) |
| 1974 | 1.82 | 8.78 | 6.62 | - | - |
| 1981 | 2.64 | 15.54 | 10.63 | 3013.70 | - |
| 1991 | 20.87 | 20.15 | 5.43 | 9873.50 | 0.49 |
| 2001 | 28.81 | 23.39 | 3.27 | 11,695.00 | 0.50 |
| 2004 | 32.76 | 25.08 | 4.29 | 16,382.00 | 0.50 |
| 2005 | 38.37 | 26.81 | 4.12 | 13,330.00 | 0.41 |
| 2010 | 46.04 | 30.46 | 3.62 | 16,382.00 | 0.48 |
| 2015 | 54.98 | 34.28 | 3.27 | 23,688.00 | 0.56 |
| 2017 | 58.75 | 35.70 | 6.0 | 27,654.00 | 0.57 |
| 2025 | 78.44 | 40.00 | - | 47,064.00 | 0.60 |