| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.75 | 8.72 | 6.36 |
| 2024 | 7.74 | 11.96 | 5.69 |
| 2023 | 10.97 | 13.54 | 7.22 |
| 2022 | 10.51 | 13.76 | 7.13 |
| 2021 | 17.06 | 22.75 | 12.65 |
| 2020 | 9.19 | 28.58 | 4.15 |
| 2019 | 4.17 | 8.39 | 2.69 |
| 2018 | 3.67 | 4.91 | 2.71 |
| 2017 | 5.99 | 9.09 | 4 |
| 2016 | 5.62 | 8.34 | 3.75 |
| 2015 | 5.68 | 10.98 | 3.67 |
| 2014 | 4.01 | 4.62 | 3.49 |
| 2013 | 5.1 | 8.26 | 2.91 |
| 2012 | 3.12 | 4.26 | 2.26 |
| 2011 | 5.04 | 6.49 | 3.15 |