| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.58 | 6.97 | 4.61 |
| 2024 | 4.64 | 6.41 | 3.62 |
| 2023 | 6.8 | 9.56 | 5.72 |
| 2022 | 7.05 | 9.47 | 5.45 |
| 2021 | 5.96 | 8.24 | 4.3 |
| 2020 | 5.16 | 6.11 | 4.23 |
| 2019 | 5.2 | 7.91 | 4.39 |
| 2018 | 5.64 | 8.12 | 4.15 |
| 2017 | 9.15 | 10.77 | 7.18 |
| 2016 | 11.2 | 14.33 | 7.74 |
| 2015 | 8.97 | 16.35 | 5.47 |
| 2014 | 5.59 | 6.93 | 4.55 |
| 2013 | 4.5 | 5.7 | 3.82 |
| 2012 | 5.62 | 7.25 | 4.71 |