| Audit fee (unit: ten thousand yuan) | 2013 | 2014 | 2015 |
| <30 | 5 | 1 | 1 |
| 30-90 | 136 | 129 | 119 |
| 90-150 | 35 | 40 | 42 |
| 150-210 | 10 | 12 | 20 |
| 210-270 | 1 | 4 | 7 |
| >270 | 13 | 14 | 11 |