| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.77 | 6.2 | 5.11 |
| 2024 | 5.92 | 8.25 | 4.49 |
| 2023 | 5.67 | 8.47 | 4.1 |
| 2022 | 5 | 6.09 | 3.95 |
| 2021 | 5.63 | 6.9 | 4.28 |
| 2020 | 8.32 | 9.86 | 6.6 |
| 2019 | 7.2 | 9.13 | 5.17 |
| 2018 | 7.13 | 9.25 | 5.55 |
| 2017 | 6.82 | 10.1 | 5.27 |
| 2016 | 6.49 | 8.45 | 4.79 |
| 2015 | 8.26 | 18.42 | 5.71 |
| 2014 | 8.77 | 11.28 | 7.13 |
| 2013 | 7.42 | 9.51 | 5.71 |
| 2012 | 4.97 | 7.7 | 3.31 |
| 2011 | 5.25 | 6.53 | 4.14 |