| Code | Definition | Number of Accessions |
| 1 | HIGHEST | 594 |
| 2 | (1 = HIGHEST, 9 = POOREST) | 235 |
| 3 | (1 = HIGHEST, 9 = POOREST) | 335 |
| 4 | (1 = HIGHEST, 9 = POOREST) | 497 |
| 5 | (1 = HIGHEST, 9 = POOREST) | 738 |
| 6 | (1 = HIGHEST, 9 = POOREST) | 722 |
| 7 | (1 = HIGHEST, 9 = POOREST) | 564 |
| 8 | (1 = HIGHEST, 9 = POOREST) | 443 |
| 9 | POOREST | 422 |