| Year | Population | Growth Rate |
| 1990 | 381,000 | - |
| 1995 | 438,000 | 2.82 |
| 2000 | 482,000 | 1.92 |
| 2005 | 529,000 | 1.88 |
| 2010 | 582,000 | 1.92 |
| 2015 | 640,000 | 1.92 |
| 2020 | 689,000 | 1.49 |