| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8.86 | 12.07 | 6.83 |
| 2024 | 8.22 | 9.83 | 6.43 |
| 2023 | 9.93 | 12.46 | 8.42 |
| 2022 | 10.3 | 14.15 | 7.99 |
| 2021 | 17.92 | 25 | 13.63 |
| 2020 | 24.02 | 33.37 | 13.29 |
| 2019 | 11.85 | 17.12 | 8.85 |
| 2018 | 11.49 | 16.33 | 6.66 |
| 2017 | 14.49 | 19.09 | 10.69 |
| 2016 | 18.25 | 26.73 | 10.56 |
| 2015 | 14.37 | 23.49 | 7.47 |
| 2014 | 17.46 | 32.27 | 9.09 |
| 2013 | 13.82 | 33.96 | 7.7 |
| 2012 | 7.58 | 8.57 | 6.53 |