| Value | Category |
|---|---|
| -1 | missing |
| 1 | english |
| 2 | french |
| 3 | portuguese |
| 4 | kiswahili |
| 100 | afrikaans |
| 101 | ndebele |
| 102 | xhosa |
| 103 | pedi/spedi/north sotho |
| 104 | sesotho/sotho/ south sotho |
| 105 | setswana/tswana |
| 106 | shangaan |
| 107 | swazi |
| 108 | venda |
| 109 | zulu |
| 995 | other |
| 998 | refused |
| 999 | don't know |