| Year | 1990 | 2005 | 2014 | |||
| Area | Area km2 | % | Area km2 | % | Area km2 | % |
| Urban areas | 65 | 25.7 | 79.4 | 31.4 | 91.2 | 36.1 |
| Non-urban areas | 187.6 | 74.3 | 173.6 | 68.6 | 161.6 | 63.9 |