| Value | Category |
|---|---|
| -9 | Don't know |
| -8 | Refusal to answer |
| 0 | |
| 3 | |
| 6 | |
| 7 | |
| 10 | |
| 13 | |
| 14 | |
| 15 | |
| 24 | |
| 30 | |
| 40 | |
| 45 | |
| 50 | |
| 60 | |
| 80 | |
| 100 | |
| 120 | |
| 150 | |
| 200 | |
| 230 | |
| 250 | |
| 280 | |
| 300 | |
| 350 | |
| 400 | |
| 450 | |
| 500 | |
| 560 | |
| 600 | |
| 780 | |
| 900 | |
| 1000 | |
| 1076 | |
| 1200 | |
| 1250 | |
| 1256 | |
| 1300 | |
| 1400 | |
| 1500 | |
| 1800 | |
| 1936 | |
| 2000 | |
| 2414 | |
| 2500 | |
| 3000 | |
| 3500 | |
| 3600 | |
| 4000 | |
| 5000 | |
| 5400 | |
| 12000 | |
| 14000 | |
| 16000 | |
| 500000 | |
| Sysmiss |