| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.38 | 7.71 | 3.85 |
| 2024 | 3.17 | 6.16 | 1.89 |
| 2023 | 4.24 | 5.35 | 3.73 |
| 2022 | 4.05 | 5.07 | 2.63 |
| 2021 | 4.26 | 5.1 | 3.7 |
| 2020 | 7.06 | 9.91 | 4.9 |
| 2019 | 6.53 | 7.8 | 5.27 |
| 2018 | 6.78 | 9.4 | 5.18 |
| 2017 | 9.39 | 12.05 | 7.25 |
| 2016 | 14.63 | 27.92 | 10.47 |
| 2015 | 15.84 | 32.98 | 6.92 |
| 2014 | 9.33 | 14.01 | 6.82 |
| 2013 | 8.23 | 12.48 | 5.5 |
| 2012 | 6.51 | 9.16 | 4.9 |
| 2011 | 11.62 | 21.98 | 7.77 |