| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.2 | 4.78 | 3.94 |
| 2024 | 4.08 | 4.79 | 3.34 |
| 2023 | 6.11 | 8.67 | 4.62 |
| 2022 | 6.52 | 12.08 | 4.71 |
| 2021 | 4.87 | 6.11 | 3.9 |
| 2020 | 4.82 | 6.71 | 3.54 |
| 2019 | 3.41 | 4.11 | 2.79 |
| 2018 | 3.87 | 4.68 | 2.76 |
| 2017 | 5.21 | 6.11 | 4.18 |
| 2016 | 6.06 | 6.98 | 5.05 |
| 2015 | 7.77 | 12.76 | 5.44 |
| 2014 | 6.44 | 7.95 | 5.5 |
| 2013 | 6.36 | 7.69 | 5.45 |
| 2012 | 6.25 | 7.47 | 5.13 |
| 2011 | 9.02 | 11.76 | 6.74 |