| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.8 | 7.63 | 5.54 |
| 2024 | 6.01 | 8.3 | 4.17 |
| 2023 | 5.56 | 10.63 | 3.29 |
| 2022 | 4.08 | 6.03 | 3.13 |
| 2021 | 5.64 | 7.12 | 4.49 |
| 2020 | 8.39 | 14.53 | 5.25 |
| 2019 | 5.15 | 7.5 | 3.86 |
| 2018 | 6.78 | 9.15 | 3.91 |
| 2017 | 10.09 | 13.5 | 8.2 |
| 2016 | 14.68 | 18.42 | 11.82 |
| 2015 | 12.7 | 23.22 | 7.61 |
| 2014 | 7.61 | 9.75 | 5.43 |
| 2013 | 6.76 | 10.71 | 4.54 |