| Value | Category |
|---|---|
| 1 | 1st |
| 2 | 2nd |
| 3 | 3rd |
| 4 | 4th |
| 5 | 5th |
| 6 | 6th |
| 7 | 7th |
| 8 | 8th |
| 9 | 9th |
| 10 | 10th |
| 11 | 11th |
| 12 | 12th |
| 13 | 13th |
| 14 | 14th |
| 15 | 15th |
| 16 | 16th |
| 17 | 17th |
| 18 | 18th |
| 19 | 19th |
| 20 | 20th |
| 21 | 21st |
| 22 | 22nd |
| 23 | 23rd |
| 24 | 24th |
| 25 | 25th |
| 26 | 26th |
| 27 | 27th |
| 28 | 28th |
| 29 | 29th |
| 30 | 30th |
| 31 | 31st |
| 33 | Missing |
| 55 | Not applicable |
| 88 | Refused |
| 99 | Don't know |
| Sysmiss |