| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8.12 | 8.97 | 7.15 |
| 2024 | 7.35 | 9.28 | 5.8 |
| 2023 | 9.68 | 17.15 | 5.96 |
| 2022 | 14.81 | 20.05 | 10.67 |
| 2021 | 20.74 | 32.79 | 11.55 |
| 2020 | 17.97 | 26.48 | 11.04 |
| 2019 | 9.04 | 12.98 | 6.3 |
| 2018 | 8.38 | 10.89 | 5.61 |
| 2017 | 7.3 | 10.61 | 4.97 |
| 2016 | 12.1 | 19.29 | 7.38 |
| 2015 | 11 | 22.93 | 6.63 |
| 2014 | 9.28 | 12.37 | 7.38 |
| 2013 | 7.08 | 9.25 | 5.17 |
| 2012 | 4.03 | 5.44 | 3.31 |
| 2011 | 5.35 | 7.62 | 3.67 |