| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 46 |
4.1%
|
| 1 | 0 :no invoices | 119 |
10.7%
|
| 2 | Between 1 and 5 | 734 |
66%
|
| 3 | More than 5 | 213 |
19.2%
|
| Sysmiss | 8264 |