| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.64 | 4.06 | 3.37 |
| 2024 | 3.5 | 4.31 | 2.94 |
| 2023 | 5.3 | 8.9 | 3.03 |
| 2022 | 5.53 | 9.42 | 3.81 |
| 2021 | 5.03 | 6.14 | 3.63 |
| 2020 | 4.59 | 6.39 | 3.38 |
| 2019 | 6.84 | 11.41 | 4.34 |
| 2018 | 7.26 | 12.06 | 3.79 |
| 2017 | 6.94 | 11.36 | 4.13 |
| 2016 | 15.67 | 23.11 | 8.08 |
| 2015 | 7.32 | 15.77 | 4.39 |
| 2014 | 5.59 | 8.81 | 3.78 |
| 2013 | 4.52 | 5.53 | 3.38 |
| 2012 | 4.83 | 6.44 | 3.15 |
| 2011 | 6.41 | 8.25 | 4.39 |