| Size Class | Surface Area (cm2) | % of Surveyed Population |
| SC1 | <200 | 39% |
| SC2 | 200 - 400 | 17% |
| SC3 | 400 - 600 | 12% |
| SC4 | 600 - 800 | 7% |
| SC5 | 800 - 1000 | 5% |
| SC6 | >1000 | 20% |