Year

NDVI average value

High risk area converge (0.5 - 0.6) value

High risk area coverage greater than (0.6) values

2007

−0.14123 - 0.79979

11403.564 Km²

2378,600 Km²

2008

−0.10843 - 0.77627

8265.424 Km²

1161.447 Km²

2009

−0.01257 - 0.7618

1965.101 Km²

458.740 Km²

2010

0.114818 - 0.793048

8959.276 Km²

2133.452 Km²

2011

0.120941 - 0.7846

7332.327 Km²

1.153.075 Km²

2012

0.150673 - 0.778815

10113.478 Km²

1458.598 Km²