| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.3 | 6.38 | 3.85 |
| 2024 | 3.72 | 5.71 | 2.77 |
| 2023 | 5.07 | 6.91 | 3.78 |
| 2022 | 4.45 | 7.31 | 3.27 |
| 2021 | 4.96 | 6.55 | 4.18 |
| 2020 | 6.94 | 10.13 | 5.04 |
| 2019 | 7.13 | 10.98 | 5.53 |
| 2018 | 9.56 | 13.84 | 6.59 |
| 2017 | 10.8 | 12.7 | 8.76 |
| 2016 | 16.32 | 21.31 | 11.75 |
| 2015 | 26.97 | 47.48 | 14.78 |
| 2014 | 11.82 | 19.83 | 7.79 |
| 2013 | 6.82 | 8.98 | 5.06 |
| 2012 | 9.39 | 16.64 | 4.63 |