| Value | Category | Cases | |
|---|---|---|---|
| 1 | Bad weather | 25 |
20.2%
|
| 2 | Lack of equipment | 16 |
12.9%
|
| 3 | Poor maintenance | 75 |
60.5%
|
| 4 | Lack of engineers | 2 |
1.6%
|
| 8 | Other | 6 |
4.8%
|
| Sysmiss | 1401 |