| Code | Definition | Number of Accessions |
| 1 | very low < 0,1 (g) | |
| 2 | very low to low 0,10 - 0,8 (g) | |
| 3 | low 0,81 - 1,5 (g) | |
| 4 | low to medium 1,51 - 2,2 (g) | |
| 5 | medium 2,21 - 2,9 (g) | 11 |
| 6 | medium to high 2,91 - 3,6 (g) | 42 |
| 7 | high 3,61 - 4,3 (g) | 34 |
| 8 | high to very high 4,31 - 5,0 (g) | 4 |
| 9 | very high > 5,0 (g) | |