| Value | Category | Cases | |
|---|---|---|---|
| 1 | Bad weather | 13 |
9.7%
|
| 2 | Lack of equipment | 5 |
3.7%
|
| 3 | Poor maintenance | 98 |
73.1%
|
| 4 | Lack of engineers | 1 |
0.7%
|
| 96 | Other | 17 |
12.7%
|
| Sysmiss | 1286 |