| Value | Category |
|---|---|
| 1 | No income |
| 2 | Less than $5,000 |
| 3 | $5,000 - $9,999 |
| 4 | $10,000 - $14,999 |
| 5 | $15,000 - $19,999 |
| 6 | $ 20,000 - $24,999 |
| 7 | $25,000 - $29,999 |
| 8 | $30,000 - $34,999 |
| 9 | $35,000 - $39,999 |
| 10 | $40,000 - $49,999 |
| 11 | $50,000 - $59,999 |
| 12 | $60,000 - $69,999 |
| 13 | $70,000 - $79,999 |
| 14 | $80,000 - $89,999 |
| 15 | $90,000 - $99,999 |
| 16 | $100,000 or more |
| 99 | Not stated |