| Code | Definition | Number of Accessions |
| 1 | very low < 50 (g) | |
| 2 | very low to low 50 - 100 (g) | 9 |
| 3 | low 101 - 150 (g) | 10 |
| 4 | low to medium 151 - 200 (g) | 5 |
| 5 | medium 201 - 250 (g) | |
| 6 | medium to high 251 - 300 (g) | |
| 7 | high 301 - 350 (g) | |
| 8 | high to very high 351 - 400 (g) | |
| 9 | very high > 400 (g) | |