| Area in 1990 | Area in 2005 | Area in 2018 | ||||||
| Class | km2 | % | Class | km2 | % | Class | km2 | % |
| Cropland | 1663.74 | 22.5 | Cropland | 1751 | 23.6 | Cropland | 1591 | 24 |
| Forest | 2953.08 | 39.8 | Forest | 2899 | 39.1 | Forest | 858 | 38.6 |
| Grassland | 836.91 | 11.3 | Grassland | 835 | 11.2 | Grassland | 826 | 11.1 |
| Wetland | 13.23 | 0.18 | Wetland | 11 | 0.14 | Wetland | 12 | 0.16 |
| Shrubland | 54.36 | 0.73 | Shrubland | 52 | 0.70 | Shrubland | 55 | 0.70 |
| Bare area | 205.74 | 2.8 | Bare land | 221 | 2.9 | Bare area | 278 | 3.75 |
| Water | 1674.45 | 22.6 | Water | 1633 | 22 | Water | 1591 | 21.4 |
| Total | 100% | Total | 100% | Total | 100% | |||