| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.12 | 5.84 | 4.38 |
| 2024 | 4.01 | 6.46 | 2.65 |
| 2023 | 5.07 | 7.05 | 3.54 |
| 2022 | 5.91 | 8.86 | 3.55 |
| 2021 | 4.91 | 7.74 | 3.33 |
| 2020 | 5.79 | 8 | 4.46 |
| 2019 | 6.3 | 7.9 | 4.32 |
| 2018 | 9.94 | 17.35 | 4.61 |
| 2017 | 19 | 22.25 | 17.35 |
| 2016 | 29.56 | 60.7 | 21.9 |
| 2015 | 28.64 | 67.44 | 11.17 |
| 2014 | 8.01 | 16.78 | 5.79 |
| 2013 | 4.83 | 6.27 | 3.88 |
| 2012 | 5.25 | 7.04 | 3.34 |
| 2011 | 8.41 | 12.22 | 6.41 |