| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 9.64 | 12.68 | 7.89 |
| 2024 | 7.99 | 10.68 | 5.36 |
| 2023 | 7.51 | 11.1 | 5.72 |
| 2022 | 6.88 | 9.24 | 5.05 |
| 2021 | 7.75 | 11.07 | 6.18 |
| 2020 | 10.17 | 12.57 | 7.4 |
| 2019 | 8.34 | 12.55 | 5.27 |
| 2018 | 6.46 | 7.86 | 5.27 |
| 2017 | 7 | 8.48 | 5.55 |
| 2016 | 8.62 | 10.68 | 7.21 |
| 2015 | 12.52 | 18.9 | 9.56 |
| 2014 | 11.21 | 14.36 | 9.18 |
| 2013 | 13.32 | 18.52 | 8.15 |