| Value | Category | Cases | |
|---|---|---|---|
| 1 | road | 683 |
59.1%
|
| 2 | air | 470 |
40.7%
|
| 3 | water | 3 |
0.3%
|
| 777 | n/a | 0 |
0%
|
| 888 | don't know | 0 |
0%
|
| 999 | missing | 0 |
0%
|
| Sysmiss | 1089 |