| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8.15 | 10.89 | 4.32 |
| 2024 | 5.51 | 13.23 | 2.49 |
| 2023 | 6.63 | 8.27 | 4.6 |
| 2022 | 6.72 | 14.29 | 4.65 |
| 2021 | 13.07 | 22.62 | 8.28 |
| 2020 | 9.85 | 23.05 | 4.31 |
| 2019 | 4.87 | 6.85 | 2.74 |
| 2018 | 4.63 | 6.73 | 2.65 |
| 2017 | 9.28 | 12.14 | 6.06 |
| 2016 | 9.98 | 13.75 | 7.58 |
| 2015 | 17 | 38.49 | 5.94 |
| 2014 | 10.52 | 16.36 | 7.08 |
| 2013 | 7.85 | 9.46 | 6.08 |
| 2012 | 6.81 | 8.62 | 5.74 |