| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-6 | 4.37/5 | 4.76/5 |
| Vol 7-12 | 4.33/5 | 4.75/5 |
| Vol 13-18 | 4.35/5 | 4.75/5 |
| Vol 19-24 | 4.33/5 | 4.75/5 |
| Vol 25-30 | 4.39/5 | 4.77/5 |
| Vol 31-36 | 4.37/5 | 4.77/5 |
| Vol 37-42 | 4.30/5 | 4.76/5 |
| Vol 43-48 | 4.36/5 | 4.77/5 |
| Vol 49-54 | 4.31/5 | 4.74/5 |
| Vol 55-60 | 4.33/5 | 4.76/5 |
| Vol 61-66 | 4.36/5 | 4.76/5 |
| Vol 67-72 | 4.33/5 | 4.76/5 |
| Vol 73-78 | 4.35/5 | 4.76/5 |
| Vol 79-84 | 4.37/5 | 4.77/5 |
| Vol 85-90 | 4.36/5 | 4.76/5 |
| Vol 91-96 | 4.36/5 | 4.76/5 |
| Vol 97-102 | 4.34/5 | 4.75/5 |
| Vol 103-108 | 4.35/5 | 4.75/5 |
| Vol 109-114 | 4.38/5 | 4.76/5 |
| Vol 115-120 | 4.41/5 | 4.79/5 |
| Vol 121-126 | 4.36/5 | 4.76/5 |
| Vol 127-130 | 4.41/5 | 4.79/5 |
| Overall | 4.35/5 | 4.79/5 |