| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
100%
|
| 1 | Transport | 0 | |
| 2 | Energy | 0 | |
| 3 | Environment | 0 | |
| 4 | Education | 0 | |
| 5 | Health | 0 | |
| 6 | Information and Communication Technology | 0 | |
| 7 | Other (spontaneous-specify) | 0 |