| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.6 | 7.42 | 5.91 |
| 2024 | 6.39 | 7.84 | 4.79 |
| 2023 | 8.25 | 10.2 | 7.25 |
| 2022 | 9.39 | 13.16 | 6.66 |
| 2021 | 11.33 | 16.61 | 8.22 |
| 2020 | 9.11 | 12.99 | 6.37 |
| 2019 | 7.59 | 9.5 | 5.02 |
| 2018 | 6.33 | 9.51 | 4.73 |
| 2017 | 10.72 | 16.15 | 8.41 |
| 2016 | 14.97 | 17.94 | 11.11 |
| 2015 | 18.17 | 31.22 | 9.98 |
| 2014 | 13.14 | 20.51 | 7.44 |
| 2013 | 8.41 | 10.07 | 6.98 |
| 2012 | 9.04 | 11.1 | 7.07 |
| 2011 | 16.88 | 24.88 | 9.04 |
| 2010 | 24.98 | 30.54 | 20.47 |