| Strata | Total of households | Sample sorted (kg d−1 fresh weight) | ||
| Year of study | ||||
| 1998 | 2004 | 1998 | 2004 | |
| Low | 65 | 80 | 183 | 208 |
| Medium | 101 | 80 | 342 | 200 |
| High | 96 | 80 | 172 | 256 |
| Total | 262 | 240 | 697 | 664 |