| Land cover types | 1986 | 1990 | 2000 | 2013 | 1986-2013 | Land cover (%) | ||||
| Area | Area | Area | Area | Area changed | 1986 | 1990 | 2000 | 2013 | ||
| (ha) | (ha) | (ha) | (ha) | (ha) | (%) | (%) | (%) | (%) | (%) | |
| Vegetation | 1918 | 1471 | 4039 | 6935 | 5017 | 262 | 1 | 1 | 2 | 3 |
| Urban | 6517 | 6530 | 8420 | 13,908 | 7391 | 113 | 3 | 3 | 4 | 6 |
| Barren Land | 24,491 | 24,431 | 6383 | 19,343 | −5148 | −21 | 11 | 11 | 3 | 9 |
| Sand | 76,783 | 72,308 | 76,768 | 70,088 | −6695 | −9 | 35 | 33 | 35 | 32 |
| Rocky | 112,684 | 117,653 | 126,783 | 112,119 | −565 | −1 | 51 | 53 | 57 | 50 |
| Total | 222,393 | 222,393 | 222,393 | 222,393 | 100 | 100 | 100 | 100 | ||