| Density Cap/km2 | Population (1000) | Year |
| 50 | 437,000 | 1948 |
| 81 | 704,000 | 1960 |
| 195 | 1,681,533 | 1981 |
| 451 | 3,855,000 | 1989 |
| 582 | 5,000,000 | 2008 |
| 670 | 5,780,000 | 2011 |