| Value | Category |
|---|---|
| -5 | other |
| -4 | missing data |
| -3 | refused to answer |
| -2 | not applicable |
| -1 | do not know |
| 0 | |
| 15 | |
| 18 | |
| 20 | |
| 25 | |
| 26 | |
| 28 | |
| 29 | |
| 30 | |
| 35 | |
| 40 | |
| 45 | |
| 50 | |
| 60 | |
| 108 | |
| 200 | |
| 250 | |
| 300 | |
| 333 | |
| 350 | |
| 400 | |
| 450 | |
| 500 | |
| 550 | |
| 600 | |
| 900 | |
| 1000 | |
| 1200 | |
| 1300 | |
| 1400 | |
| 1500 | |
| 1600 | |
| 1700 | |
| 1800 | |
| 2000 | |
| 2200 | |
| 2300 | |
| 2500 | |
| 2650 | |
| 2800 | |
| 3000 | |
| 3500 | |
| 4000 | |
| 4500 |