Table 3.

Classification of RII.

Scale	Level of contribution	RII
1	Very low	0.0 ≤ RII ≤ 0.2
2	Low	0.2 < RII ≤ 0.4
3	Average	0.4 < RII ≤ 0.6
4	High	0.6 < RII ≤ 0.8
5	Very high	0.8 < RII ≤ 1.0