| F | E | D | C | B | A | Service level | Weight |
| 9.0 | 7.0 | 6.0 | 4.0 | 3.0 | 1.0 | A | 0.421 |
| 8.0 | 6.0 | 5.0 | 3.0 | 1.0 | 0.333 | B | 0.256 |
| 7.0 | 5.0 | 4.0 | 1.0 | 0.333 | 0.25 | C | 0.163 |
| 5.0 | 4.0 | 1.0 | 0.25 | 0.2 | 0.167 | D | 0.09 |
| 3.0 | 1.0 | 0.25 | 0.2 | 0.167 | 0.143 | E | 0.046 |
| 1.0 | 0.333 | 0.2 | 0.143 | 0.125 | 0.111 | F | 0.026 |