| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 9.6 | 10.36 | 8.66 |
| 2025 | 8.66 | 10.49 | 6.62 |
| 2024 | 8.38 | 12.77 | 5.85 |
| 2023 | 8.77 | 12.77 | 4 |
| 2022 | 4.87 | 7.21 | 3.79 |
| 2021 | 4.76 | 7.46 | 3.16 |
| 2020 | 5.04 | 8.21 | 2.82 |
| 2019 | 3.92 | 5.84 | 3.19 |
| 2018 | 4.07 | 5.51 | 2.94 |
| 2017 | 7 | 12.58 | 4.28 |
| 2016 | 8.26 | 10.3 | 6.74 |
| 2015 | 13 | 22.78 | 7.3 |
| 2014 | 14.62 | 19.01 | 11.41 |
| 2013 | 15.49 | 18.1 | 12.52 |