| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-8 | 3.09/5 | 4.62/5 |
| Vol 9-16 | 2.76/5 | 4.52/5 |
| Vol 17-24 | 2.59/5 | 4.46/5 |
| Vol 25-32 | 2.68/5 | 4.53/5 |
| Vol 33-40 | 2.64/5 | 4.48/5 |
| Vol 41-48 | 2.58/5 | 4.53/5 |
| Vol 49-56 | 2.59/5 | 4.59/5 |
| Vol 57-64 | 2.63/5 | 4.53/5 |
| Vol 65-72 | 2.52/5 | 4.45/5 |
| Vol 73-80 | 2.44/5 | 4.52/5 |
| Vol 81-88 | 2.63/5 | 4.61/5 |
| Vol 89-96 | 2.33/5 | 4.33/5 |
| Vol 97-104 | 2.56/5 | 4.59/5 |
| Vol 105-112 | 2.27/5 | 4.51/5 |
| Vol 113-120 | 2.28/5 | 4.49/5 |
| Vol 121-128 | 3.33/5 | 4.63/5 |
| Vol 129-136 | 3.21/5 | 4.60/5 |
| Vol 137-144 | 2.95/5 | 4.57/5 |
| Vol 145-152 | 2.96/5 | 4.68/5 |
| Vol 153-160 | 2.75/5 | 4.41/5 |
| Vol 161-168 | 2.69/5 | 4.47/5 |
| Vol 169-176 | 2.67/5 | 4.49/5 |
| Vol 177-184 | 2.78/5 | 4.63/5 |
| Vol 185-192 | 2.52/5 | 4.45/5 |
| Vol 193-198 | 2.75/5 | 4.51/5 |
| Overall | 2.69/5 | 4.68/5 |