| Value | Category | Cases | |
|---|---|---|---|
| 1 | Manually | 115 |
35.2%
|
| 2 | Special vehicles | 11 |
3.4%
|
| 3 | Both methods | 2 |
0.6%
|
| 4 | Other | 0 |
0%
|
| Sysmiss | 199 |