| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-3 | 3.46/5 | 4.58/5 |
| Vol 4-6 | 3.51/5 | 4.58/5 |
| Vol 7-9 | 3.34/5 | 4.57/5 |
| Vol 10-12 | 3.70/5 | 4.62/5 |
| Vol 13-15 | 3.78/5 | 4.62/5 |
| Vol 16-18 | 3.89/5 | 4.65/5 |
| Vol 19-21 | 3.73/5 | 4.63/5 |
| Vol 22-24 | 3.85/5 | 4.61/5 |
| Vol 25-27 | 3.96/5 | 4.70/5 |
| Vol 28-30 | 3.83/5 | 4.62/5 |
| Vol 31-33 | 3.92/5 | 4.65/5 |
| Vol 34-36 | 3.83/5 | 4.65/5 |
| Vol 37-39 | 4.03/5 | 4.62/5 |
| Vol 40-42 | 3.78/5 | 4.63/5 |
| Vol 43-45 | 3.93/5 | 4.67/5 |
| Vol 46-48 | 3.40/5 | 4.63/5 |
| Vol 49-51 | 3.58/5 | 4.54/5 |
| Vol 52-54 | 3.85/5 | 4.65/5 |
| Vol 55-57 | 4.02/5 | 4.68/5 |
| Vol 58-60 | 4.04/5 | 4.67/5 |
| Vol 61-63 | 4.19/5 | 4.69/5 |
| Vol 64-66 | 4.19/5 | 4.70/5 |
| Vol 67-69 | 4.16/5 | 4.71/5 |
| Vol 70-72 | 4.14/5 | 4.67/5 |
| Vol 73-74 | 4.18/5 | 4.67/5 |
| Overall | 3.83/5 | 4.71/5 |