| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-5 | 3.65/5 | 4.73/5 |
| Vol 6-10 | 3.64/5 | 4.69/5 |
| Vol 11-15 | 3.49/5 | 4.72/5 |
| Vol 16-20 | 3.35/5 | 4.68/5 |
| Vol 21-25 | 3.49/5 | 4.69/5 |
| Vol 26-30 | 3.71/5 | 4.69/5 |
| Vol 31-35 | 3.57/5 | 4.68/5 |
| Vol 36-40 | 3.62/5 | 4.73/5 |
| Vol 41-45 | 3.62/5 | 4.68/5 |
| Vol 46-50 | 3.66/5 | 4.75/5 |
| Vol 51-55 | 3.44/5 | 4.67/5 |
| Vol 56-60 | 3.83/5 | 4.75/5 |
| Vol 61-65 | 3.83/5 | 4.72/5 |
| Vol 66-70 | 3.92/5 | 4.74/5 |
| Vol 71-75 | 3.37/5 | 4.65/5 |
| Vol 76-80 | 3.38/5 | 4.71/5 |
| Vol 81-85 | 3.27/5 | 4.65/5 |
| Vol 86-90 | 3.05/5 | 4.57/5 |
| Vol 91-95 | 3.46/5 | 4.72/5 |
| Vol 96-100 | 3.37/5 | 4.68/5 |
| Vol 101 | 3.78/5 | 4.67/5 |
| Overall | 3.53/5 | 4.75/5 |