| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Per single trip | 599 |
0.4%
|
| 2 | 2. Per return trip | 975 |
0.6%
|
| 3 | 3. Per week | 3026 |
1.9%
|
| 4 | 4. Per month | 3635 |
2.3%
|
| 5 | 5. Do not know | 537 |
0.3%
|
| 8 | 8. Not applicable | 147856 |
94%
|
| 9 | 9. Unspecified | 645 |
0.4%
|