| Value | Category | Cases | |
|---|---|---|---|
| 1 | Traffic | 545 |
14.6%
|
| 2 | Aircraft | 3 |
0.1%
|
| 3 | Quarries and cutting stones | 20 |
0.5%
|
| 4 | Building | 46 |
1.2%
|
| 5 | Industrial activities | 96 |
2.6%
|
| 6 | Other | 247 |
6.6%
|
| Sysmiss | 2782 |