| Year | Total inhabitants | Total households | Inhabitants per household | DSW generation | |
| (t∙d−1) | (g∙inh−1∙d−1) | ||||
| 1998 | 510,463 | 123,300 | 4.1 | 321 | 628.8 |
| 2004 | 549,996 | 133,634 | 4.1 | 442 | 803.6 |
| 2012* | 829,625 | 184,601 | 4.5 | 710 | 855.8 |