| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.19 | 6.18 | 3.78 |
| 2024 | 3.93 | 5.19 | 2.87 |
| 2023 | 6.82 | 9.6 | 4.51 |
| 2022 | 5.86 | 8.77 | 3.49 |
| 2021 | 4.88 | 8.44 | 3.41 |
| 2020 | 4.75 | 8.85 | 3.72 |
| 2019 | 4.57 | 5.95 | 3.95 |
| 2018 | 5.07 | 6.85 | 3.66 |
| 2017 | 9.01 | 12.48 | 6.5 |
| 2016 | 12.08 | 15.04 | 9.05 |
| 2015 | 14.3 | 25.69 | 8.21 |
| 2014 | 16.12 | 26.3 | 11.25 |
| 2013 | 9.58 | 19.24 | 6.22 |