Category	1984		1990		2000		2011
Category	Area (km²)	%	Area (km²)	%	Area (km²)	%	Area (km²)	%
Farmland	2288	21.98	3501	33.63	3320	31.89	3707	35.61
Vegetation	5814	55.85	4578	43.98	4719	45.33	3849	36.97
Grassland	2233	21.45	2255	21.66	2179	20.93	2401	23.06
Settlement	54	0.52	51	0.49	137	1.32	394	3.78
Water body	3	0.03	5	0.05	39	0.37	33	0.32
Rock	18	0.17	18	0.17	17	0.16	26	0.25
Total	10,410	100.00	10,410	100.00	10410	100.00	10,410	100.00