| Value | Category |
|---|---|
| -9 | Skilled production workers (Don't Know) |
| 0 | |
| 1 | |
| 2 | |
| 3 | |
| 4 | |
| 5 | |
| 6 | |
| 7 | |
| 8 | |
| 9 | |
| 10 | |
| 11 | |
| 12 | |
| 13 | |
| 14 | |
| 15 | |
| 16 | |
| 17 | |
| 18 | |
| 19 | |
| 20 | |
| 21 | |
| 22 | |
| 23 | |
| 24 | |
| 25 | |
| 26 | |
| 28 | |
| 30 | |
| 31 | |
| 32 | |
| 33 | |
| 34 | |
| 35 | |
| 36 | |
| 38 | |
| 40 | |
| 42 | |
| 44 | |
| 45 | |
| 48 | |
| 50 | |
| 51 | |
| 52 | |
| 55 | |
| 58 | |
| 60 | |
| 62 | |
| 65 | |
| 68 | |
| 70 | |
| 75 | |
| 78 | |
| 80 | |
| 85 | |
| 90 | |
| 95 | |
| 98 | |
| 100 | |
| 106 | |
| 110 | |
| 120 | |
| 125 | |
| 130 | |
| 145 | |
| 146 | |
| 150 | |
| 160 | |
| 170 | |
| 180 | |
| 190 | |
| 200 | |
| 205 | |
| 210 | |
| 220 | |
| 230 | |
| 240 | |
| 250 | |
| 260 | |
| 280 | |
| 300 | |
| 320 | |
| 350 | |
| 360 | |
| 400 | |
| 450 | |
| 500 | |
| 600 | |
| 650 | |
| 700 | |
| 729 | |
| 800 | |
| 1000 | |
| 1100 | |
| 1200 | |
| 1500 | |
| 1800 | |
| 2000 | |
| 2200 | |
| 2500 | |
| 2520 | |
| 3000 | |
| 3395 | |
| 4000 | |
| 13000 | |
| Sysmiss |