| Rank | Variables | Contribution (%) |
| 1 | Cement (Ce) | 15.28 |
| 2 | Gas Fuels (Ga) | 14.7 |
| 3 | Li ∩ So | 13.66 |
| 4 | Ga ∩ So | 13.47 |
| 5 | Ga ∩ Ce | 12.56 |
| 6 | Liquid Fuels (Li) | 10.63 |
| 7 | So ∩ Gf | 9.65 |
| 8 | Gf ∩ Ce | 7.9 |