| Value | Category |
|---|---|
| -9 | DON’T KNOW (SPONTANEOUS) |
| 1 | Quite often, because we needed them |
| 2 | Occasionally, because we did not need them so much |
| 3 | We did not use them, because their services are not needed |
| 4 | We did not use them, because their services did not meet our |
| 5 | We did not use them, because their services were expensive |
| 6 | Other |
| Sysmiss |