| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.97 | 9.04 | 5.47 |
| 2024 | 5.17 | 7.13 | 3.91 |
| 2023 | 6.78 | 11.07 | 4.87 |
| 2022 | 4.99 | 6.44 | 3.73 |
| 2021 | 6.79 | 8.7 | 5.43 |
| 2020 | 7.34 | 13.75 | 3.68 |
| 2019 | 4.29 | 7.28 | 2.07 |
| 2018 | 3.39 | 4.38 | 2.06 |
| 2017 | 5.06 | 6.82 | 4.14 |
| 2016 | 17.91 | 25.35 | 6.58 |
| 2015 | 18.21 | 27.1 | 10.68 |
| 2014 | 11.91 | 16.31 | 7.84 |
| 2013 | 6.19 | 8.62 | 4.19 |
| 2012 | 7.1 | 10.71 | 3.6 |
| 2011 | 10.92 | 26.21 | 5.75 |