| Value | Category |
|---|---|
| -5 | other |
| -4 | missing |
| -3 | refused to answer |
| -2 | not applicable |
| -1 | do not know |
| 0 | |
| 120 | |
| 300 | |
| 400 | |
| 500 | |
| 600 | |
| 700 | |
| 800 | |
| 900 | |
| 1000 | |
| 1100 | |
| 1150 | |
| 1200 | |
| 1400 | |
| 1500 | |
| 1550 | |
| 1600 | |
| 1700 | |
| 2000 | |
| 2151 | |
| 2300 | |
| 2400 | |
| 2500 | |
| 2600 | |
| 3000 | |
| 3080 | |
| 3500 | |
| 3800 | |
| 4000 | |
| 4500 | |
| 4800 | |
| 5000 | |
| 5500 | |
| 6000 | |
| 6070 | |
| 6500 | |
| 7000 | |
| 8000 | |
| 10000 | |
| 11000 | |
| 15000 | |
| 18000 | |
| 20000 | |
| 25000 |