| Year | 2000 | 2010 | 2022 | |||
| Classes | Area (km2) | % | Area (km2) | % | Area (km2) | % |
| Forest Land | 25,951.4 | 21.9 | 24,177.0 | 20.4 | 22,825.4 | 19.3 |
| Cropland | 58,528.8 | 49.5 | 59,415.4 | 50.2 | 60,421.3 | 51.1 |
| Grassland | 3358.6 | 2.8 | 3180.4 | 2.7 | 2978.9 | 2.5 |
| Wetland | 30,097.1 | 25.4 | 30,902.1 | 26.1 | 31,306.1 | 26.5 |
| Settlements | 240.1 | 0.2 | 513.2 | 0.4 | 686.6 | 0.6 |
| Other Land | 144.4 | 0.1 | 132.3 | 0.1 | 102.1 | 0.1 |