| Class | 1989 | 2002 | 2010 | 2020 | ||||
| Area (Km2) | (%) | Area (Km2) | (%) | Area (Km2) | (%) | Area (Km2) | (%) | |
| Forest | 11,060.60 | 55.8 | 10,255.73 | 51.8 | 8989.48 | 45.5 | 7564.42 | 38.2 |
| Cropland | 2205.48 | 11.1 | 3582.07 | 18.1 | 4421.28 | 22.4 | 5981.86 | 30.2 |
| Water | 127.25 | 0.6 | 106.89 | 0.5 | 177.78 | 0.9 | 136.52 | 0.7 |
| Shrubs | 6128.43 | 30.9 | 5291.20 | 26.7 | 5758.05 | 29.2 | 5488.07 | 27.7 |
| Bareland | 294.08 | 1.5 | 580.10 | 2.9 | 401.47 | 2.0 | 645.13 | 3.3 |
| Total | 19,815.83 | 100.0 | 19,815.99 | 100.0 | 19,748.06 | 100.0 | 19,815.99 | 100.0 |