| Value | Category | Cases | |
|---|---|---|---|
| 1 | jusque 10% | 142 |
17.9%
|
| 2 | env. 15% | 243 |
30.6%
|
| 3 | env. 20% | 215 |
27%
|
| 4 | env. 30% | 80 |
10.1%
|
| 5 | plus de 30% | 57 |
7.2%
|
| 6 | ne sait pas | 58 |
7.3%
|