| Value | Category | Cases | |
|---|---|---|---|
| 1 | User fees/tariffs | 555 |
47.7%
|
| 2 | Maintenance costs | 595 |
51.2%
|
| 3 | Other, specify | 0 |
0%
|
| 8 | 13 |
1.1%
|
|
| Sysmiss | 1779 |