| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8.74 | 11.89 | 7.06 |
| 2024 | 6.99 | 10.44 | 4.42 |
| 2023 | 9.91 | 14.37 | 6.84 |
| 2022 | 7.61 | 10.77 | 5.86 |
| 2021 | 6.41 | 9.57 | 5.28 |
| 2020 | 7.91 | 10.76 | 5.95 |
| 2019 | 7.35 | 12.73 | 5.38 |
| 2018 | 8.46 | 12.33 | 6.97 |
| 2017 | 17.77 | 41.12 | 7.33 |
| 2016 | 24.36 | 33.06 | 14.91 |
| 2015 | 17.42 | 36.73 | 8.94 |
| 2014 | 9.82 | 13.27 | 7.47 |
| 2013 | 8.49 | 11.08 | 5.91 |
| 2012 | 9.59 | 12.85 | 7.17 |