| particular year | Number of total visitors (ten thousand) | Number of ordinary visitors (ten thousand) | Number of professional visitors (ten thousand) | Proportion of professional visitors | Year on year growth of professional visitors |
| 2019 | 32 | 12.5 | 17.5 | 54.7% | 16.67% |
| 2018 | 30 | 15 | 15 | 50% | 30% |