| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 7.65 | 7.98 | 7.27 |
| 2025 | 8.4 | 9.59 | 7.53 |
| 2024 | 8.49 | 11.19 | 7.34 |
| 2023 | 10.9 | 15.73 | 7.5 |
| 2022 | 15.14 | 19.47 | 11.04 |
| 2021 | 22.78 | 31.58 | 15.45 |
| 2020 | 21.06 | 30.29 | 13.17 |
| 2019 | 14.36 | 16.76 | 10.67 |
| 2018 | 11.59 | 14.32 | 9.69 |
| 2017 | 8.25 | 10.29 | 6.6 |
| 2016 | 7.14 | 8.53 | 6.48 |
| 2015 | 8.77 | 10.74 | 6.97 |