| Value | Category |
|---|---|
| -5 | other |
| -4 | missing data |
| -3 | refused to answer |
| -2 | not applicable |
| -1 | do not know |
| 0 | |
| 1 | |
| 20 | |
| 40 | |
| 50 | |
| 60 | |
| 70 | |
| 100 | |
| 110 | |
| 120 | |
| 150 | |
| 160 | |
| 170 | |
| 180 | |
| 190 | |
| 200 | |
| 250 | |
| 260 | |
| 280 | |
| 300 | |
| 330 | |
| 350 | |
| 400 | |
| 450 | |
| 500 | |
| 560 | |
| 570 | |
| 600 | |
| 700 | |
| 750 | |
| 800 | |
| 850 | |
| 900 | |
| 1000 | |
| 1100 | |
| 1200 | |
| 1400 | |
| 1500 | |
| 1700 | |
| 1800 | |
| 2000 | |
| 2350 | |
| 3000 | |
| 6000 |