| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Manual | 599 | 8904 |
20.9%
|
| 2 | Special tools | 34 | 498 |
1.2%
|
| 3 | Both methods | 31 | 467 |
1.1%
|
| Sysmiss | 2095 | 32742 |