| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | No method | 1990 |
90.8%
|
| 1 | Folkloric method | 4 |
0.2%
|
| 2 | Traditional method | 46 |
2.1%
|
| 3 | Modern method | 151 |
6.9%
|