| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-5 | 3.58/5 | 4.63/5 |
| Vol 6-10 | 3.58/5 | 4.59/5 |
| Vol 11-15 | 3.43/5 | 4.62/5 |
| Vol 16-20 | 3.23/5 | 4.58/5 |
| Vol 21-25 | 3.38/5 | 4.59/5 |
| Vol 26-30 | 3.59/5 | 4.59/5 |
| Vol 31-35 | 3.48/5 | 4.58/5 |
| Vol 36-40 | 3.54/5 | 4.63/5 |
| Vol 41-45 | 3.51/5 | 4.58/5 |
| Vol 46-50 | 3.61/5 | 4.65/5 |
| Vol 51-55 | 3.33/5 | 4.57/5 |
| Vol 56-60 | 3.75/5 | 4.65/5 |
| Vol 61-65 | 3.78/5 | 4.62/5 |
| Vol 66-70 | 3.84/5 | 4.64/5 |
| Vol 71-75 | 3.26/5 | 4.55/5 |
| Vol 76-80 | 3.30/5 | 4.61/5 |
| Vol 81-85 | 3.20/5 | 4.55/5 |
| Vol 86-90 | 2.95/5 | 4.47/5 |
| Vol 91-95 | 3.29/5 | 4.62/5 |
| Vol 96-100 | 3.26/5 | 4.58/5 |
| Vol 101 | 3.68/5 | 4.57/5 |
| Overall | 3.45/5 | 4.65/5 |