| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.71 | 8.03 | 5.43 |
| 2024 | 3.71 | 9.94 | 2.35 |
| 2023 | 3.58 | 5.02 | 2.79 |
| 2022 | 3.28 | 4.81 | 2.5 |
| 2021 | 3.83 | 4.61 | 3.3 |
| 2020 | 4.56 | 7.45 | 3.54 |
| 2019 | 3.56 | 9.51 | 2.37 |
| 2018 | 3.66 | 6.12 | 2.51 |
| 2017 | 6.15 | 8.2 | 4.25 |
| 2016 | 8.64 | 11.79 | 6.23 |
| 2015 | 14.16 | 32.07 | 6.82 |
| 2014 | 5.78 | 8.74 | 4.77 |
| 2013 | 3.97 | 4.97 | 3.15 |
| 2012 | 2.71 | 2.71 | 2.71 |