| Value | Category | Cases | |
|---|---|---|---|
| 1 | Bad Weather | 23 |
10.1%
|
| 2 | Lack of equipment | 12 |
5.3%
|
| 3 | Poor maintenance | 150 |
66.1%
|
| 4 | Lack of engineers | 1 |
0.4%
|
| 8 | Others | 41 |
18.1%
|
| Sysmiss | 891 |