| Value | Category | Cases | |
|---|---|---|---|
| 1 | Manual | 0 |
0%
|
| 2 | Special tools | 2 |
0.3%
|
| 3 | Both methods | 2 |
0.3%
|
| 6 | 3 |
0.5%
|
|
| 7 | 1 |
0.2%
|
|
| 9 | 1 |
0.2%
|
|
| 12 | 1 |
0.2%
|
|
| Sysmiss | 617 |