| Land use types | Year 1996 | Year 2001 | Year 2005 | Year 2010 | Year 2014 | |||||
| Area (ha) | % | Area(ha) | % | Area(ha) | % | Area(ha) | % | Area(ha) | % | |
| Agricultural land: | 339,582 | 43.5 | 332,426 | 42.5 | 325,593 | 41.7 | 314,023 | 40.2 | 312,967 | 40.1 |
| -Cultivated | 200,880 | 25.7 | 174,287 | 22.3 | 185,153 | 23.7 | 152,495 | 19.5 | 108,997 | 14.0 |
| -Non-cultivated | 138,701 | 17.8 | 158,139 | 20.2 | 140,439 | 18.0 | 161,528 | 20.7 | 203,970 | 26.1 |
| Others | 441,701 | 56.5 | 448,857 | 57.5 | 455,690 | 58.3 | 467,260 | 59.8 | 468,315 | 59.9 |