Grad 1: 100-250
Grad 2: 200-500
Grad 3: 400-1000
Grad 4: 750-2000
Grad 5: 1500-3500
Grad 6: 2500-5000
Grad 7: 4500- 9000
Grad 8: 8000-17500
Grad 9: 15000-30000