Table 3. Values of r x 100, exclusive of the uninhabited Nam On river watershed.

1960s–1981 1981–1992/1993
Full map area, not scale corrected: -0.490 n/a
Full map area, scale corrected: 0.061 n/a
1992/1993 map area, not scale corrected: -0.647 0.126
1992/1993 map area, scale corrected: -0.227 -0.069
Mean -0.326 0.029