| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8.78 | 11.3 | 7.99 |
| 2024 | 9.29 | 11.01 | 8.03 |
| 2023 | 10.85 | 13.5 | 8.17 |
| 2022 | 9.49 | 12.19 | 7.42 |
| 2021 | 12.29 | 14.59 | 9.98 |
| 2020 | 7.47 | 12.18 | 3.73 |
| 2019 | 4.93 | 6.45 | 4.02 |
| 2018 | 8.4 | 11.16 | 4.67 |
| 2017 | 8.66 | 11.51 | 7.75 |
| 2016 | 8.08 | 8.79 | 7.02 |
| 2015 | 9.91 | 13.17 | 7.32 |
| 2014 | 8.55 | 10.96 | 7.33 |
| 2013 | 11.31 | 13.43 | 9.4 |
| 2012 | 7.51 | 9.79 | 5.8 |
| 2011 | 9.74 | 12.89 | 6.24 |
| 2010 | 15.17 | 26.05 | 12.43 |