| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 6.25 | 6.95 | 5.29 |
| 2023 | 8.21 | 11.7 | 6.12 |
| 2022 | 8.41 | 11.34 | 5.54 |
| 2021 | 13.42 | 16.17 | 10.78 |
| 2020 | 13.85 | 20.11 | 9.65 |
| 2019 | 9 | 12.43 | 6.13 |
| 2018 | 6.45 | 7.44 | 5.42 |
| 2017 | 6.37 | 7.61 | 5.43 |
| 2016 | 8.07 | 13.31 | 6.96 |
| 2015 | 12.47 | 24.13 | 6.91 |
| 2014 | 7.88 | 10.18 | 6.6 |
| 2013 | 5.95 | 7.12 | 3.71 |