| Value | Category | 
|---|---|
| -5 | other | 
| -4 | missing | 
| -3 | refused to answer | 
| -2 | not applicable | 
| -1 | do not know | 
| 0 | |
| 5 | |
| 5.5 | |
| 9 | |
| 10 | |
| 12 | |
| 18 | |
| 20 | |
| 21 | |
| 24 | |
| 28 | |
| 30 | |
| 35 | |
| 36 | |
| 40 | |
| 48 | |
| 50 | |
| 56 | |
| 60 | |
| 68 | |
| 70 | |
| 80 | |
| 84 | |
| 100 | |
| 110 | |
| 120 | |
| 130 | |
| 136 | |
| 140 | |
| 150 | |
| 160 | |
| 176 | |
| 180 | |
| 200 | |
| 216 | |
| 250 | |
| 256 | |
| 260 | |
| 285 | |
| 300 | |
| 350 | |
| 360 | |
| 400 | |
| 430 | |
| 450 | |
| 480 | |
| 500 | |
| 600 | |
| 704 | |
| 800 | |
| 1000 | |
| 1200 | |
| 1400 | |
| 1500 | |
| 2000 | |
| 2500 | |
| 3000 | |
| 4000 | |
| 5000 | |
| 6000 | |
| 7000 |