| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 5.68 | 6.56 | 4.91 |
| 2025 | 5.16 | 6.27 | 3.86 |
| 2024 | 3.8 | 6.61 | 2.27 |
| 2023 | 4.24 | 4.9 | 3.71 |
| 2022 | 4.09 | 5.26 | 3.09 |
| 2021 | 4.51 | 6.41 | 2.41 |
| 2020 | 3.81 | 6.12 | 3.05 |
| 2019 | 4.19 | 5.99 | 3.46 |
| 2018 | 5.62 | 7.94 | 3.54 |
| 2017 | 7.53 | 10.39 | 5.83 |
| 2016 | 9.32 | 11.98 | 7.69 |
| 2015 | 13.71 | 17.2 | 9.36 |