| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 7.49 | 9.21 | 6.12 |
| 2025 | 6.76 | 8.81 | 5.75 |
| 2024 | 6.45 | 8.57 | 4.65 |
| 2023 | 7.38 | 8.88 | 5.81 |
| 2022 | 6.97 | 11.17 | 4.37 |
| 2021 | 5.9 | 11.71 | 4.01 |
| 2020 | 6.95 | 10.41 | 4.88 |
| 2019 | 7 | 12.39 | 4.52 |
| 2018 | 5.8 | 8.61 | 3.95 |
| 2017 | 5.78 | 8.31 | 4.3 |
| 2016 | 9.47 | 13.5 | 7.64 |
| 2015 | 8.41 | 15.72 | 5.25 |
| 2014 | 5.65 | 7.45 | 4.02 |
| 2013 | 4.18 | 5.29 | 3.36 |