| Area (in %) | year 2011 | ||||
| Bare land and building | Grassland | Woodland | Total | ||
| year 1987 | Bare land and building | 23.8 | 3.4 | 1.9 | 29.1 |
| Grassland | 19.2 | 26.1 | 11.4 | 56.7 | |
| Woodland | 3.2 | 5.0 | 6.1 | 14.2 | |
| Total | 46.2 | 34.5 | 19.3 | 100.0 | |
| Area (in %) | year 2015 | ||||
| Bare land and building | Grassland | Woodland | Total | ||
| year 2011 | Bare land and building | 44.9 | 0.8 | 0.5 | 46.2 |
| Grassland | 9.4 | 16.6 | 8.4 | 34.5 | |
| Woodland | 5.7 | 4.2 | 9.5 | 19.3 | |
| Total | 60.0 | 21.6 | 18.4 | 100.0 | |
| Area (in %) | year 2021 | ||||
| Bare land and building | Grassland | Woodland | Total | ||
| year 2015 | Bare land and building | 52.5 | 6.4 | 1.1 | 60.0 |
| Grassland | 6.7 | 11.2 | 3.6 | 21.6 | |
| Woodland | 2.1 | 4.3 | 12.0 | 18.4 | |
| Total | 61.3 | 22.0 | 16.7 | 100.0 | |