| Value | Category |
|---|---|
| -9 | DON’T KNOW (SPONTANEOUS) |
| 0 | |
| 1 | Highly-skilled production workers |
| 2 | |
| 3 | |
| 4 | |
| 5 | |
| 6 | |
| 7 | |
| 8 | |
| 9 | |
| 10 | |
| 11 | |
| 12 | |
| 13 | |
| 15 | |
| 16 | |
| 17 | |
| 18 | |
| 19 | |
| 20 | |
| 21 | |
| 22 | |
| 23 | |
| 24 | |
| 25 | |
| 27 | |
| 28 | |
| 30 | |
| 31 | |
| 32 | |
| 33 | |
| 34 | |
| 35 | |
| 40 | |
| 41 | |
| 42 | |
| 45 | |
| 46 | |
| 48 | |
| 50 | |
| 55 | |
| 57 | |
| 59 | |
| 60 | |
| 62 | |
| 66 | |
| 68 | |
| 70 | |
| 75 | |
| 80 | |
| 81 | |
| 88 | |
| 89 | |
| 90 | |
| 94 | |
| 100 | |
| 120 | |
| 124 | |
| 130 | |
| 150 | |
| 152 | |
| 154 | |
| 160 | |
| 168 | |
| 173 | |
| 174 | |
| 175 | |
| 177 | |
| 200 | |
| 210 | |
| 229 | |
| 249 | |
| 250 | |
| 259 | |
| 280 | |
| 290 | |
| 300 | |
| 325 | |
| 350 | |
| 365 | |
| 374 | |
| 400 | |
| 450 | |
| 464 | |
| 562 | |
| 1500 | |
| Sysmiss |