| Value | Category | 
|---|---|
| -5 | other | 
| -4 | missing | 
| -3 | refused to answer | 
| -2 | not applicable | 
| -1 | do not know | 
| 0 | |
| 7 | |
| 12 | |
| 13 | |
| 18 | |
| 20 | |
| 22 | |
| 25 | |
| 30 | |
| 40 | |
| 45 | |
| 50 | |
| 60 | |
| 70 | |
| 75 | |
| 80 | |
| 100 | |
| 105 | |
| 120 | |
| 150 | |
| 160 | |
| 180 | |
| 195 | |
| 200 | |
| 250 | |
| 280 | |
| 300 | |
| 344 | |
| 400 | |
| 420 | |
| 500 | |
| 550 | |
| 560 | |
| 600 | |
| 700 | |
| 800 | |
| 875 | |
| 900 | |
| 1000 | |
| 1400 | |
| 1500 | |
| 2000 | |
| 2670 | |
| 3000 | |
| 4000 | |
| 5000 | |
| 6000 | |
| 7000 | |
| 8000 | |
| 10000 | |
| 50000 |